Enable hacking H404 test.
Enable hacking H404 test.

H404 - multi line docstring should start with a summary.

Change-Id: I2099e1ee81ff9657f7a07401b8e8f3327d03bdbd

akash1808/oslo.db,vikt0rs/oslo.db,openstack/oslo.db,varunarya10/oslo.db,malor/oslo.db,JioCloud/oslo.db,openstack/oslo.db,magic0704/oslo.db