Update docs structure according to new guidelines in https://wiki.opnfv.org/display/DOC

Change-Id: I69e6536d9044dd9db2ed3cd698059aa3a800c318
Signed-off-by: Gerald Kunzmann <kunzmann@docomolab-euro.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
-
-============
-Introduction
-============
-
-Resource reservation is a basic function for the operation of a virtualized
-telecom network. In resource reservation, VIM reserves resources for a certain
-period as requested by the NFVO. A resource reservation will have a start time
-which could be into the future. Therefore, the reserved resources shall be
-available for the NFVO requested purpose (e.g. for a VNF) at the start time for
-the duration asked by NFVO. Resources include all three resource types in an
-NFVI i.e. compute, storage and network.
-
-Besides, NFVO requires abstracted NFVI resource capacity information in order
-to take decisions on VNF placement and other operations related to the virtual
-resources. VIM is required to inform the NFVO of NFVI resource state
-information for this purpose. Promise project aims at delivering the detailed
-requirements on these two features defined in ETSI NFV MAN GS [NFVMAN]_,
-the list of gaps in upstream projects, potential implementation architecture
-and plan, and the VIM northbound interface specification for resource
-reservation and capacity management.
-
-Problem description
-===================
-
-OpenStack, a prominent candidate for the VIM, cannot reserve resources for
-future use. OpenStack requires immediate instantiation of Virtual Machines
-(VMs) in order to occupy resources intended to be reserved. Blazar can reserve
-compute resources for future by keeping the VMs in shelved mode. However, such
-reserved resources can also be used for scaling out rather than new VM
-instantiation. Blazar does not support network and storage resource reservation
-yet.
-
-Besides, OpenStack does not provide a northbound interface through which it can
-notify an upper layer management entity e.g. NFVO about capacity changes in its
-NFVI, periodically or in an event driven way. Capacity management is a feature
-defined in ETSI NFV MAN GS [NFVMAN]_ and is required in network operation.