Rename UpdateDefaultQuotas to UpdateDefaultQuotasStep

A class with the name of UpdateDefaultQuotas was declared twice in the
same file. Rename one occurrence to UpdateDefaultQuotasStep.

Change-Id: Ie2adb0d540656c5b106607bfc992f553ad1fa45b
Closes-Bug: #1285135
Clean up Cinder client traces in the test output

The Volumes index page has 2 tabs now, for volumes and snapshots. The
calls to list the snapshots were not mocked in a couple of places.

Change-Id: I0f4a59c19b7f5dfb12df41f8c9d3261eea802874
Closes-Bug: #1284665
Merge "Clean up Cinder client traces in the test output"
Merge "Rename UpdateDefaultQuotas to UpdateDefaultQuotasStep"