The rescue tests requires neutron resources

test_rescued_vm_add_remove_security_group and
the test_rescued_vm_associate_dissociate_floating_ip does not makes
sense if the instance does not have a network connection.

'network' and 'subnet' would be sufficient for the security_group test
case, but the router is required for floating_ip test case.

Closes-Bug: #1274121
Change-Id: Ic8e70d5e549573213b2930d88b5d7da5cd4cf855
Merge "The rescue tests requires neutron resources"