Make the vmware pause/unpause unit tests actually test something

The pause/unpause tests for vmware were just passing so this patch
actually makes them test the pause/unpause methods for the
VMwareESXDriver and VMwareVCDriver classes.

Closes-Bug: #1237679

Change-Id: Idf7c6e6f9542b9ab4dd2ab710597f1a198889dfa
Merge "Make the vmware pause/unpause unit tests actually test something"