NCAR / manage_externals / 48

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Debugging git remotes and status

More work debugging git remotes and sync state status determination. Add logic
to determine if a tag exists and is unique (not also a branch). Add more unit
tests for determining synce state, verify regexps work, checking tags.

Add debug output to system tests so it is as simple copy/paste to rerun a test
manually.

Testing:
  python2/3 - unit/sys tests - pass
  python2/3 - manual checkout, status - ok

449 of 582 branches covered (77.15%)

Branch coverage included in aggregate %.

1580 of 1852 relevant lines covered (85.31%)

2.13 hits per line