* gnu/packages/openstack.scm (python-requests-mock): Update to 1.0.0. [inputs]: Remove python-setuptools. Move python-mock ... [native-inputs]: ... to here. Add python-discover, python-fixtures, python-sphinx, python-testrepostory, python-testtools. [properties]: Add python2-variant. (python2-requests-mock): inherit stripped variant. [native-inputs]: Use python2-setuptools.