tests: port test-ui-color.py to Python 3
As in some other tests, I like confirming that we're dealing with
bytes here, so the b prefix is now in the expected output on both 2
and 3.
Differential Revision: https://phab.mercurial-scm.org/D3512
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)