tests: prevent printing \r to stdout
Like we've done in other recent commits, we need to change
sys.stdout on Python 3 to not use os.linesep so output is
consistent on Python 3 on Windows.
With this change, test-notify.t now passes on Python 3 on Windows!
Differential Revision: https://phab.mercurial-scm.org/D8342
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
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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