Provider Segment Support for Cisco Nexus Switches

This spec describes the work being done by the blueprint
https://blueprints.launchpad.net/neutron/+spec/ \
ml2-cisco-nexus-mechdriver-providernet
which implements ML2 provider segment support
for the Cisco 3K, 5K and 7K Nexus switches.

Change-Id: I733b007f629e601101ba2938fecc734deef7d5a6
Merge "Provider Segment Support for Cisco Nexus Switches"