py3: add warnings in check-code related to py3...
py3: add warnings in check-code related to py3
We have our own bytes versions of things like, getopt.getopt, os.sep, os.name,
sys.executable, os.environ and few more for python 3 portability. Its better
to come up with warnings if someone breaks the things which we have fixed.
After this patch, check-code will warn us to use our bytes version.
These checks run on mercurial/ and hgext/ and pycompat.py is excluded.
