add metadata proxy support for Quantum Networks
add metadata proxy support for Quantum Networks

blueprint metadata-overlapping-networks

Adds Metadata for guest VMs running on Qunatum networks.  This requires
a companion patchset for Nova to test.

Change-Id: I524c6fdcd6a44e46da08395fd84c1288052a69ea

CiscoSystems/networking-cisco,openstack/networking-cisco,CiscoSystems/networking-cisco,Gitweijie/first_project,Tehsmash/networking-cisco,nikolay-fedotov/networking-cisco,cisco-openstack/networking-cisco,Tehsmash/networking-cisco,Tehsmash/networking-cisco-nexus,noironetworks/networking-cisco,noironetworks/networking-cisco,Tehsmash/networking-cisco-apic,openstack/networking-cisco,hareeshpc/networking-cisco,Gitweijie/first_project,cisco-openstack/networking-cisco,hareeshpc/networking-cisco