Feature OVS in openvim

Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>

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+# Overlay network connectivity in Openvim with OVS instead of Linux Bridges #
+
+## Proposer ##
+- Alfonso Tierno (Telefonica)
+- Gerardo Garcia (Telefonica)
+
+## Type ##
+**Feature**
+
+## Target MDG/TF ##
+RO
+
+## Description ##
+OpenVIM currently uses pre-provisioned Linux bridges to create the overlay
+networks used to interconnect the VMs. Those Linux bridges are built on a host
+interface and are associated with a VLAN tag, which is used to transport frames
+between VMs located in different hosts across a switching infrastructure.
+
+Linux bridges, while working well in practice, have limitations (e.g. VLAN as
+the only mechanism for achieving isolation). It also lacks some advanced
+capabilities (L3 filtering, IP tunneling, support of Openflow rules, etc.).
+
+Open vSwitch (OVS) (http://www.openvswitch.org/) provides those advanced
+capabilities and would be better aligned with future OSM needs and use cases.
+
+This feature proposes the support of OVS in openvim as an alternative to Linux
+Bridges. Openvim installer and configuration files should provide options to
+use either Linux Bridges or OVS. Scripts for automatic configuration of hosts
+should also provide that option.
+
+
+## Demo or definition of done ##
+N/A