load_gen: Supporting loading of load_gen via loader.

Currently all tools are loaded via loader utility, except load_gen.
Load_gens were loaded directly through component_factory.
This patch adds support to load load_gens through loader utility.

The changes are as follows:
1. Configuration changes:The common.conf include configuration of
   directory. testcases.conf includes changes to load configuration,
   where tool is no more part of the load-configuration. The
   custom.conf has configuration of LOADGEN to be used - this configuration
   replaces the earlier 'tool' configuration parameter.
2. loader_utility_changes:  In loader.py, loadgen_loader is
   defined, which is used in new get_loadgen function.
3. component_factory changes: in create_loadgen, similar
   to other tools, the function just retuns the object of loadgen_class.
4. Renaming of Dummy load_gen: Loader fails to load properly a dummy
   loadgen due to name-clash with dummy in pkt_gen. To avoid this name clash
   dummy is renamed to dummyloadgen.
5. testcase changes: create_loadgen is now called with output of
   loader's get_loadgen_class.
6. Fixed Pylint Errors and extra-space at the end.
7. Included CLI options support for --loadgen and --list-loadgens.
   Thanks to Martin K.
8. Added the missing loadgen parameter in testcases.conf.
9. Fixed the missing comma error.
10. Added CI change in build-vsperf.sh
11. Fixed configuration reading in stress/stress.py

JIRA: VSPERF-533

Change-Id: I3fbb259618825a12fef55320a748a4f02509190b
Signed-off-by: Sridhar K. N. Rao <sridhar.rao@spirent.com>
Signed-off-by: Martin Klozik <martinx.klozik@intel.com>

1 files changed, 6 insertions, 16 deletions

diff --git a/core/component_factory.py b/core/component_factory.py
index 0256b85c..bd9a1019 100644
--- a/core/component_factory.py
+++ b/core/component_factory.py
@@ -24,9 +24,6 @@ from core.vswitch_controller_op2p import VswitchControllerOP2P
 from core.vswitch_controller_ptunp import VswitchControllerPtunP
 from core.vnf_controller import VnfController
 from core.pktfwd_controller import PktFwdController
-from tools.load_gen.stress.stress import Stress
-from tools.load_gen.stress_ng.stress_ng import StressNg
-from tools.load_gen.dummy.dummy import DummyLoadGen
 
 
 def __init__():
@@ -115,24 +112,17 @@ def create_collector(collector_class, result_dir, test_name):
     """
     return collector_class(result_dir, test_name)
 
-def create_loadgen(loadgen_type, loadgen_cfg):
-    """Return a new ILoadGenerator for the loadgen type.
+def create_loadgen(loadgen_class, loadgen_cfg):
+    """Return a new ILoadGenerator for the loadgen class.
 
-    The returned load generator has the given loadgen type and loadgen
-    generator class.
+    The returned load generator is of given loadgen generator class.
 
-    :param loadgen_type: Name of loadgen type
-    :param loadgen_class: Reference to load generator class to be used.
+    :param loadgen_class: Name to load generator class to be used.
+    :param loadgen_cfg: Configuration for the loadgen
     :return: A new ILoadGenerator class
     """
     # pylint: disable=too-many-function-args
-    loadgen_type = loadgen_type.lower()
-    if loadgen_type.find("dummy") >= 0:
-        return DummyLoadGen(loadgen_cfg)
-    elif loadgen_type.find("stress-ng") >= 0:
-        return StressNg(loadgen_cfg)
-    elif loadgen_type.find("stress") >= 0:
-        return Stress(loadgen_cfg)
+    return loadgen_class(loadgen_cfg)
 
 def create_pktfwd(deployment, pktfwd_class):
     """Return a new packet forwarder controller