This creates credentials needed for testpypi.python.org. I've also
stored the information in our password file.
Also start fleshing out release-openstack-python job allowing us to
install twine and pypirc on to the executor.
Change-Id: I06422102b6af209bd22d05faa6202e480a128f84
Signed-off-by: Paul Belanger <pabelanger@redhat.com>