Add VMware-NSX to StackForge

This repository will hold the Neutron drivers for the
VMware NSX. This is required by [1].

The need of setting this repo up is inline with
spec proposal [2], where core elements of the Neutron
project are decoupled by the internals of the
technology being supported.

[1] https://review.openstack.org/#/c/102720/
[2] https://review.openstack.org/#/c/134680/

Change-Id: I2820f1403cfd34390320f5841786f4065d0e4cf0
Merge "Add VMware-NSX to StackForge"