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Bugfix: regexp for determining git tracking branches

The regexp for determining git tracking branches could not
correctly detect a tracking branch when the local branch was
ahead or behind the remote. Update regexp, document additional
requirement in doc string, and add unit tests for new
requirement.

Testing:
    make test - python2 - all tests pass, one skip

301 of 344 branches covered (87.5%)

Branch coverage included in aggregate %.

967 of 1041 relevant lines covered (92.89%)

0.93 hits per line