Add neutron support

- Add network driver to switch between nova-network (default) and neutron
- Add option to perform Security group management via neutron
- IP filter for instance detailed view (hiding trove owned/managed network info)
- Add unittests and intergration tests

Implements blueprint neutron-support

  Related patch:
    SHA:        bd54d99aa0b717007d79891eb7839b660616eb6f

Change-Id: Ia0103bcda6590a4e387038ec035aee15454cdf48
Merge "Add neutron support"