[Shtoom] note: unit tests

[Zooko Wilcox-O'Hearn]

The patch named "fix typo in test_callcontrol.py" fixes the 
test_callcontrol.testOutboundLocalBye unit test.

I'm now looking at the testInboundRemoteBye unit test.

Since there are several known bugs in call control state, I want to 
figure out how to add more unit tests to exercise that code better.

--Z