Updated doc locations for new structure

Change-Id: I8d948bad350ec90618edac5fc451167c06e8baa5
Signed-off-by: Trevor Cooper <trevor.cooper@intel.com>

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-.. This work is licensed under a Creative Commons Attribution 4.0 International License.
-.. http://creativecommons.org/licenses/by/4.0
-.. (c) OPNFV, Intel Corporation, AT&T and others.
-
-===================================
-Traffic Generator Integration Guide
-===================================
-
-Intended Audience
-=================
-
-This document is intended to aid those who want to integrate new traffic
-generator into the vsperf code. It is expected, that reader has already
-read generic part of :ref:`vsperf-design`.
-
-Let us create a sample traffic generator called **sample_tg**, step by step.
-
-Step 1 - create a directory
-===========================
-
-Implementation of trafficgens is located at tools/pkt_gen/ directory,
-where every implementation has its dedicated sub-directory. It is
-required to create a new directory for new traffic generator
-implementations.
-
-E.g.
-
-.. code-block:: console
-
-   $ mkdir tools/pkt_gen/sample_tg
-
-Step 2 - create a trafficgen module
-===================================
-
-Every trafficgen class must inherit from generic **ITrafficGenerator**
-interface class. VSPERF during its initialization scans content of pkt_gen
-directory for all python modules, that inherit from **ITrafficGenerator**. These
-modules are automatically added into the list of supported traffic generators.
-
-Example:
-
-Let us create a draft of tools/pkt_gen/sample_tg/sample_tg.py module.
-
-.. code-block:: python
-
-    from tools.pkt_gen import trafficgen
-
-    class SampleTG(trafficgen.ITrafficGenerator):
-        """
-        A sample traffic generator implementation
-        """
-        pass
-
-VSPERF is immediately aware of the new class:
-
-.. code-block:: console
-
-   $ ./vsperf --list-trafficgen
-
-Output should look like:
-
-.. code-block:: console
-
-   Classes derived from: ITrafficGenerator
-   ======
-
-   * Ixia:             A wrapper around the IXIA traffic generator.
-
-   * IxNet:            A wrapper around IXIA IxNetwork applications.
-
-   * Dummy:            A dummy traffic generator whose data is generated by the user.
-
-   * SampleTG:         A sample traffic generator implementation
-
-   * TestCenter:       Spirent TestCenter
-
-
-Step 3 - configuration
-======================
-
-All configuration values, required for correct traffic generator function, are passed
-from VSPERF to the traffic generator in a dictionary. Default values shared among
-all traffic generators are defined in **conf/03_traffic.conf** within **TRAFFIC**
-dictionary. Default values are loaded by **ITrafficGenerator** interface class
-automatically, so it is not needed to load them explicitly. In case that there are
-any traffic generator specific default values, then they should be set within class
-specific **__init__** function.
-
-VSPERF passes test specific configuration within **traffic** dictionary to every
-start and send function. So implementation of these functions must ensure,
-that default values are updated with the testcase specific values. Proper merge
-of values is assured by call of **merge_spec** function from **conf** module.
-
-Example of **merge_spec** usage in **tools/pkt_gen/sample_tg/sample_tg.py** module:
-
-.. code-block:: python
-
-    from conf import merge_spec
-
-    def start_rfc2544_throughput(self, traffic=None, duration=30):
-        self._params = {}
-        self._params['traffic'] = self.traffic_defaults.copy()
-        if traffic:
-            self._params['traffic'] = merge_spec(
-                self._params['traffic'], traffic)
-
-
-Step 4 - generic functions
-==========================
-
-There are some generic functions, which every traffic generator should provide.
-Although these functions are mainly optional, at least empty implementation must
-be provided. This is required, so that developer is explicitly aware of these
-functions.
-
-The **connect** function is called from the traffic generator controller from its
-**__enter__** method. This function should assure proper connection initialization
-between DUT and traffic generator. In case, that such implementation is not needed,
-empty implementation is required.
-
-The **disconnect** function should perform clean up of any connection specific
-actions called from the **connect** function.
-
-Example in **tools/pkt_gen/sample_tg/sample_tg.py** module:
-
-.. code-block:: python
-
-    def connect(self):
-        pass
-
-    def disconnect(self):
-        pass
-
-.. _step-5-supported-traffic-types:
-
-Step 5 - supported traffic types
-================================
-
-Currently VSPERF supports three different types of tests for traffic generators,
-these are identified in vsperf through the traffic type, which include:
-
-    * RFC2544 throughput - Send fixed size packets at different rates, using
-        traffic configuration, until minimum rate at which no packet loss is
-        detected is found. Methods with its implementation have suffix
-        **_rfc2544_throughput**.
-
-    * RFC2544 back2back - Send fixed size packets at a fixed rate, using traffic
-        configuration, for specified time interval. Methods with its
-        implementation have suffix **_rfc2544_back2back**.
-
-    * continuous flow - Send fixed size packets at given framerate, using traffic
-        configuration, for specified time interval. Methods with its
-        implementation have suffix **_cont_traffic**.
-
-In general, both synchronous and asynchronous interfaces must be implemented
-for each traffic type. Synchronous functions start with prefix **send_**.
-Asynchronous with prefixes **start_** and **wait_** in case of throughput
-and back2back and **start_** and **stop_** in case of continuous traffic type.
-
-Example of synchronous interfaces:
-
-.. code-block:: python
-
-    def send_rfc2544_throughput(self, traffic=None, tests=1, duration=20,
-                                lossrate=0.0):
-    def send_rfc2544_back2back(self, traffic=None, tests=1, duration=20,
-                               lossrate=0.0):
-    def send_cont_traffic(self, traffic=None, duration=20):
-
-Example of asynchronous interfaces:
-
-.. code-block:: python
-
-    def start_rfc2544_throughput(self, traffic=None, tests=1, duration=20,
-                                 lossrate=0.0):
-    def wait_rfc2544_throughput(self):
-
-    def start_rfc2544_back2back(self, traffic=None, tests=1, duration=20,
-                                lossrate=0.0):
-    def wait_rfc2544_back2back(self):
-
-    def start_cont_traffic(self, traffic=None, duration=20):
-    def stop_cont_traffic(self):
-
-Description of parameters used by **send**, **start**, **wait** and **stop**
-functions:
-
-    * param **traffic**: A dictionary with detailed definition of traffic
-      pattern. It contains following parameters to be implemented by
-      traffic generator.
-
-      Note: Traffic dictionary has also virtual switch related parameters,
-      which are not listed below.
-
-      Note: There are parameters specific to testing of tunnelling protocols,
-      which are discussed in detail at :ref:`integration-tests` userguide.
-
-      * param **traffic_type**: One of the supported traffic types,
-        e.g. **rfc2544_throughput**, **rfc2544_continuous**
-        or **rfc2544_back2back**.
-      * param **frame_rate**: Defines desired percentage of frame
-        rate used during continuous stream tests.
-      * param **bidir**: Specifies if generated traffic will be full-duplex
-        (true) or half-duplex (false).
-      * param **multistream**: Defines number of flows simulated by traffic
-        generator. Value 0 disables MultiStream feature.
-      * param **stream_type**: Stream Type defines ISO OSI network layer
-        used for simulation of multiple streams.
-        Supported values:
-
-        * **L2** - iteration of destination MAC address
-        * **L3** - iteration of destination IP address
-        * **L4** - iteration of destination port of selected transport protocol
-
-      * param **l2**: A dictionary with data link layer details, e.g. **srcmac**,
-        **dstmac** and **framesize**.
-      * param **l3**: A dictionary with network layer details, e.g. **srcip**,
-        **dstip** and **proto**.
-      * param **l3**: A dictionary with transport layer details, e.g. **srcport**,
-        **dstport**.
-      * param **vlan**: A dictionary with vlan specific parameters,
-        e.g. **priority**, **cfi**, **id** and vlan on/off switch **enabled**.
-
-    * param **tests**: Number of times the test is executed.
-    * param **duration**: Duration of continuous test or per iteration duration
-      in case of RFC2544 throughput or back2back traffic types.
-    * param **lossrate**: Acceptable lossrate percentage.
-
-Step 6 - passing back results
-=============================
-
-It is expected that methods **send**, **wait** and **stop** will return
-values measured by traffic generator within a dictionary. Dictionary keys
-are defined in **ResultsConstants** implemented in
-**core/results/results_constants.py**. Please check sections for RFC2544
-Throughput & Continuous and for Back2Back. The same key names should
-be used by all traffic generator implementations.
-