Bug 1031103 - Skip test_bug659743.xlm on Android 2.3 for too many intermittent time outs; no review
Bug 1044657 - Move PYTHON_UNIT_TESTS to moz.build; r=mshal

As a first step, this moves PYTHON_UNIT_TESTS to moz.build as a passthru
variable. In the future, we could hook it up to |mach test|.

The __init__.py files may not need to be in the list, but I don't want to
change the list here.
Bug 1044973 - Avoid storing None in the |unexpected| array in machformatter.py; r=ahal
In the case of an unexpected pass, there will be no |message| field in the
data, which will lead to a None message in the tuple. This will trip up
the "".join() call in test_end.