NCAR / manage_externals

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Bugfix in regexp to work with git 1.8 output

The screen output of 'git branch -vv' changed between version 1.8 and 2.10.
Update the regexp parsing this output to be compatible with both versions. Add
new unit test for this output.

Testing:
    make test - pass, 1 skip - python2/3
    manual testing - escomp-cesm, clm-demo, cesm-demo, checkout, status - ok

558 of 618 branches covered (90.29%)

Branch coverage included in aggregate %.

1852 of 1960 relevant lines covered (94.49%)

2.36 hits per line