Upgrade to Hacking 0.7

There was a bug in hacking 0.6 that broke H202, assertRaises Exception
too broad, so switch to Hacking 0.7 and fix the one H202 bug.

Change-Id: Ia3fb22d1524022479d7068cb84a3bdf7ca19f408
Merge "Upgrade to Hacking 0.7"