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
Merge "Bump hacking to 0.9.x series"