Changes to NVP plugin configuration file
Changes to NVP plugin configuration file

Tweak devstack support to the nicira plugin in order to
reflect changes made in:

https://review.openstack.org/#/c/26427

This complements fixes for bug #1121605

Change-Id: I221466fb40412ceb457d3e888767291a76176aa6

armando-migliaccio/devstack