sync test-requirement with global requirements
sync test-requirement with global requirements

This change is got by tacker tool sync_test_requirements.py
in https://review.openstack.org/#/c/441572/

Change-Id: I5242c6ff856463d30811ec240a5a9fa8eb39e189

stackforge/python-tackerclient,stackforge/python-tackerclient,openstack/python-tackerclient,openstack/python-tackerclient