Fix individual unit test selection.
Review Request #2136 — Created Feb. 18, 2011 and submitted
Fix individual unit test selection. A recent change hard-coded testing of all of Review Board's codebase. This moves back to using --where so that, by default, it will test the whole codebase, but if a specific module is used, it will test that instead.
Was able to use it to test individual tests again. Running the whole test suite still works.