Pin test-requirements to match OpenStack requirements
Pin test-requirements to match OpenStack requirements

A new release of flake8 is causing lint faiures. Our requirements
should match OpenStack requirements anyway.

This patch pins to the current master requirements from the
OpenStack requirements repository using global-requirements.

Change-Id: I0b57a2623c36b7b294b572e3ad12084265026818

Logan2211/openstack-ansible-lxc_container_create,openstack/openstack-ansible-lxc_container_create,openstack/openstack-ansible-lxc_container_create,Logan2211/openstack-ansible-lxc_container_create