Convert cinder utils tests to use mock

Convert the tests using mox to use mock.  Also add several
new tests to increase overall test coverage.

Closes-bug: 1285905
Change-Id: Ic7ed128e860aec50f135a9fd8728b868b27640ba
Updated from global requirements

Change-Id: I864af28306bd6d3efc3c1101e3510456465b9a66
Merge "Convert cinder utils tests to use mock"
Merge "Updated from global requirements"