Remove setup.py check from pep8 job
Using "python setup.py check -r -s" method of checking the package has
been deprecated with the new recommendation to build the sdist and
wheel, then running "twine check" against the output.
Luckily, there is already a job that covers this that only runs when the
README, setup.py, or setup.cfg files change, making running this in the
pep8 job redundant. This covered by the test-release-openstack-python3
that is defined in the publish-to-pypi-python3 template.
More details can be found in this mailing list post:
Signed-off-by: Sean McGinnis <firstname.lastname@example.org>