tests: mark tests that fail when using chg as #require no-chg
As far as I can tell, most of these failures are due to using $HGPORT, which it
seems chg might be using itself? I don't know enough to debug these failures to
fix them properly.
Differential Revision: https://phab.mercurial-scm.org/D3562
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
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$ hg debuginstall # sanity-check setup
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Running without installing::
$ make local # build for inplace usage
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See https://mercurial-scm.org/ for detailed installation
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