Fix obtaining of service VM ip

service_instance module fails when VM in Nova is up, but get response from
Nova does not include network data. Expected field 'networks' is empty.
Fix is workaround for nova/neutron b_u_g #1210483

Change-Id: I4e066a07bb35ce85c2ac4513fbf027c9e84d5aa2
Closes-Bug: #1348632
Merge "Fix obtaining of service VM ip"