update requirements of openstackdocstheme and Sphinx for python 3. Remove Babel, it's not needed anymore See http://lists.openstack.org/pipermail/openstack-discuss/2020-April/014227.html Change-Id: Ie8cf945f17427a9427755dff2f43c36777548c3d
, add .testr.cof" Change-Id: I5abe3fe60897e22edefaf226f9431d5ade2797e1