run-tests: handle --local before --with-hg
We no longer support them both together, so this is now safe to do. By
checking --local first, we avoid error out about an invalid --with-hg
script if --local was also given (we instead tell the user that the
options are mutually exclusive).
I also had to wrap the 'binpath' we pass to setattr() in _strpath() to
keep `python3 run-tests.py -l` working. That change also made `python3
run-tests.py -l --chg` work, which was the reason for this series.
Differential Revision: https://phab.mercurial-scm.org/D6760
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