Ports depend on the subnets in the same network.

Without establishing this implicit dependency, the following
sometimes occurs:
- Ports get assigned to instances without any IP address
- Stack delete fails as ports still exist in subnets.

Fixes bug: #1192371

Change-Id: Ifd892cef4c2eebaea5568afbd320c8865c845d70
tests : remove duplicate suspend tests

A previous patch erroneously introduced two copies of the same
tests, remove the stackServiceTest duplicates as they already
exist in the stackServiceSuspendResumeTest testcase.

Change-Id: Iec00fd8dbe0d0bc6b2718b03cc4fe40b9ba481c3
Merge "tests : remove duplicate suspend tests"
Merge "Ports depend on the subnets in the same network."