Update the deallocate_for_instance method to icehouse version

Change-Id: I7a4de6c8778723b39021f376a853616b0513fb35
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>
Update the _build_network_info_model method to icehouse version

DHC-2457

Change-Id: If67c45749fb46fbbf9065c4f6fa7230cb9ed4400
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>
Fix an issue that was preventing nova to boot normal vms

The havana change to the allocate_for_instance method was
removing the device_owner attribute from the dict passed
as param when a port is created. Neutron Icehouse introduced
a new notification system that notifies nova when a port
has been created. The notification fails if the device_owner
attribute is not passed.

Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>

Change-Id: I0ffc4dd57c7c604464481cc6e39943529b87278f
Merge pull request #25 from rodis/stable/icehouse

Update the deallocate_for_instance method to icehouse version