Updated openstack/openstack
Project: openstack/oslo-incubator  6c65adfd4edb677e4658b176beb8b9800761c7cb

Remove requirements-py3

All the requirements are now Python 3 compatible (or at least
installable) so let's remove our special case requirements-py3.txt and
test-requirements-py3.txt

Change-Id: I63b92deda05809842a04f42f5c03f7b718c2089b