Error occurred while removing instance due to neutron api updated

This is a community nova change in: nova/network/neutronv2/api.py.
https://github.com/openstack/nova/commit/
65a4a6b0085f8639de2df2ccb5a17a5449d676ae
Need driver to change to db object to nova object before call the api

Change-Id: Ia783eec434f9d167b3386e5fa58496e952dbc7b4
Closes-Bug: 1379691
Merge "Error occurred while removing instance due to neutron api updated"