Fix Teiid Designer's Unit Tests

Teiid Designer's Unit test framework has not been completed converted to a full set of working tests.

There are a number of test plugins that are NOT part of the nightly build.
There are a number of tests that are even failing in the IDE

Some of our test plugins use PowerMock and/or Mockito. Need to decide if we continue with these or replace them.

Converting test-related JIRAs to sub-tasks