Fix regression in cloud server tests

Commit 116bd3cb13d76f61fe779b55d5591da671ae471b broke the cloud server contrib
tests because they mocked the default Clients calls instead of the resource's
nova function. This patch adds the correct mocks to the cloud servers tests.

Closes-Bug: #1257947

Change-Id: I904eb9f7e6424603d42b0d59c44e4da16726368c
Account for truncated resource names in test PhysName

The utility class PhysName was blindly comparing resource
name without considering that the resource name may
have also been truncated.

Closes-Bug: #1251379

Change-Id: I189f79ee5238b7c82eff1595ef612efb1f8633d4
Merge "Fix regression in cloud server tests"
Merge "Account for truncated resource names in test PhysName"