LisaTest: Replace runTest with overridden __init__
Created by: bjackman
runTest is detected and run as a test by nosetests, since it has 'Test' in the
name. We just added it so that we could instantiate LisaTest objects
easily (like t = FreqInvarianceTest()). Instead, remove it and override
__init__ with a default methodName that doesn't have 'test' in the name.