[stable-2.7] Pin openshift version for k8s test.

This will avoid spontaneous test failure for new releases of openshift on PyPI.
(cherry picked from commit 150cdd7931)

Co-authored-by: Matt Clay <matt@mystile.com>

test/integration/targets/k8s/runme.sh

@@ -21,5 +21,5 @@ ansible-playbook -v playbooks/merge_type_fail.yml "$@"
 # Run full test suite
 virtualenv --system-site-packages --python "${PYTHON}" "${MYTMPDIR}/openshift-recent"
 source "${MYTMPDIR}/openshift-recent/bin/activate"
-$PYTHON -m pip install 'openshift>=0.7.0'
+$PYTHON -m pip install 'openshift==0.7.2'
 ansible-playbook -v playbooks/full_test.yml "$@"