While the passing the 'runHangAnalyzer=false' argument to assert.soon works well in mosts tests, there are a few replica set tests that expect throws of assert.soon calls located several functions deep into the ReplSetTest fixture.

In such cases, it would be cleaner if we had global enable/disable methods for the hang analyzer and let tests wrap an enable/disable pair around the places where they expect assert.soon to fail, to be used as such:

...
hangAnalyzer.disable();

// This ultimately triggers an assert.soon failure.
timeoutExpectedByTest();

hangAnalyzer.enable();
...