enable H401 hacking check
enable H401 hacking check

This change corrects H401 (docstring should not start with a space)
errors and enables the check
Change-Id: I2f798421d5895fcec349c757d27b7f085ee001e7
Partial-Bug: 1329017

citrix-openstack-build/neutron-fwaas,gaolichuang/neutron-fwaas,gaolichuang/neutron-fwaas,openstack/neutron-fwaas,dougwig/x-neutron-fwaas,openstack/neutron-fwaas