py3: whitelist another nine passing tests I now see 347 tests passing[0] and 336 failing, so we're past halfway there. Hooray! 0: A few tests appear to regress in small ways (doctest output changes, for example) on Python 3.7.0a1, which is what I'm now using to test. That said, I'm pleased to report no major regressions. Differential Revision: https://phab.mercurial-scm.org/D2439