Bump the volume backing file size for functional tests
export DEVSTACK_LOCAL_CONFIG="enable_plugin neutron https://git.openstack.org/openstack/neutron"
export ENABLED_SERVICES=q-qos
+ # NOTE(dtroyer): Functional tests need a bit more volume headroom
+ export VOLUME_BACKING_FILE_SIZE=20G
+
function post_test_hook {{
# NOTE(stevemar): After the newton release was tagged the file was moved.
# But, we run functional tests for various stable releases
