Remove the _get_available_networks method

DHC-1474

With this fix landed https://review.openstack.org/#/c/45691/
nova will delegate permission checking to neutron, so we don't
need to override _get_available_networks anymore to show all
networks for admin user.

Change-Id: I1e60c4df25869e16bf4e98cd48917cb0fafcffd2
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>
Updte the allocate_for_instance method

DHC-1474

In the havana cycle a lot of changes landed into the parent
method, so lets replace the old method with the parent and
cherry pick the only change we added.

Change-Id: I71d265b7b3e0c5348d5da0a1450cfc8d1a49d1f0
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>
Update the deallocate_for_instance method

DHC-1474

The parent method changed in the havana cycle so lets copy
it and cherry pick the only change we added.

Change-Id: I40434ad80f72f42e8c1cc0173f9dce67e972c128
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>
Merge pull request #13 from rodis/feature/update-to-havana

Update to havana