Fix a typo in fetch_revocation_list

Change-Id: Ida17b6246e6c8dc5ca9c170bd2694e4ff1f24381
Fix and enable Gating on H404

Enable gating on the Hacking H404 check - docstring
should start with a summary.

Change-Id: I80612a15bd11f689e9e9f4dc2ff812138630ddbd
Merge "Fix a typo in fetch_revocation_list"