Bump hacking to 0.9.x series

Hacking 0.9.0 had a minor bug so require 0.9.1 or higher.

In order to keep this patch to just a requirements bump, ignore new and
stricter hacking rules that are being triggered. Fixing up the code and
turning these on is out of scope of this patch and is for future patches.

Change-Id: Iafbd4adae8c6b446d53b62dfc490eab8e76a43ac
Fix H401,H402 violations and re-enable gating

H401 and H402 got stricter in hacking 0.9, so fix new violations and
re-enable gating.

Change-Id: I4785d14edee1ffdf32e2900f6e6234cbecab6d8a
Merge "Bump hacking to 0.9.x series"
Merge "Fix H401,H402 violations and re-enable gating"