Enable H304 pep8 test in tacker code
Enable H304 pep8 test in tacker code

H304 no relative imports

Change-Id: I9314c12c78816220d47f8d50c0488c38cfe4b0da
Related-Bug: 1515930

zeinsteinz/tacker,openstack/tacker,stackforge/tacker,stackforge/tacker,openstack/tacker,zeinsteinz/tacker,priya-pp/Tacker,trozet/tacker,openstack/tacker,priya-pp/Tacker,trozet/tacker