nova-network can't deallocate ips from deleted  instances
nova-network can't deallocate ips from deleted  instances

Allow nova-network to deallocate assigned IPs from deleted instances

Fix bug #939580

Change-Id: Ib24fea0701cf640721cd0b021c78c8c5dfbb507b
Signed-off-by: François Charlier <780e1f26efd09276d04c8a298f3dd0bf35f4534e@enovance.com>

n0ano/ganttclient