tests: add Python 3 output for test-remotefilelog-gc.t Python 3 raises a slightly different error on invalid paths. Differential Revision: https://phab.mercurial-scm.org/D5773

hg: raise Abort on invalid path Currently, some os.path functions when opening repositories may raise an uncaught TypeError or ValueError if the path is invalid. Let's catch these exceptions and turn them into an Abort for convenience. Differential Revision: https://phab.mercurial-scm.org/D5772

subrepo: bytes/str cleanups on Git support Git subrepo tests now pass on Python 3. Differential Revision: https://phab.mercurial-scm.org/D5768

tests: compare against a bytes in test-lock.py skip-blame: just b'' prefixes Differential Revision: https://phab.mercurial-scm.org/D5771

tests: perform a shallow copy instead of a deep copy Python 3 can't perform a deep copy because it looks like symbols in the locals() namespace are not deep-copyable. For the curious, somehow the deepcopy() is attempting to copy objects attached to the unittest.* functions for the running test! We don't use deepcopy() anywhere in the code base and a shallow object copy should be sufficient to test lock copying. Actually, I'm not sure why we even test this, as I couldn't find copy.copy() being used for lock copying either. Who knows. Differential Revision: https://phab.mercurial-scm.org/D5770

tests: make and use a new `svnurlof.py` helper for constructing svn urls The previous trick of a Python oneliner and some subshells is too hard to make portable, and this lets us consolidate some Windows-specific logic down to a single place. Differential Revision: https://phab.mercurial-scm.org/D5766