Validate VV Set exists in 3PAR drivers

The 3PAR drivers must first create a volume and then add that
volume to a virtual volume set on the backend for QoS support.
If that predefined virutal volume set does not exists the
volume would not be associated with the correct QoS settings.
This patch will now look to see if the virtaul volume set
exists and if not will delete the volume and notify the user
that the VV Set does not exists.

Change-Id: I460f6dd7001362b850c49454c78673aecd4cfef0
Fixes: bug 1218554
Remove unused/redundant methods in cinder/test.py

The following methods are not used anywhere in Cinder
- assertDictListMatch()
- assertSubDictMatch()

The following methods are implemented in testtools
- assertIn()
- assertNotIn()

Change-Id: Iea96f7761c33ac774b5b4ae71e544aa007ba1bb2
Merge "Remove unused/redundant methods in cinder/test.py"
Merge "Validate VV Set exists in 3PAR drivers"