Update hacking to hacking>=0.8.0,<0.9

Update hacking to hacking>=0.8.0,<0.9

Update hacking version to match version specified in requirements repo.

Fixed the following issues, which the newer version checks for:
print "" -> print("")
self.assertEquals -> self.assertEqual
self.assertNotEquals -> self.assertNotEqual

Change-Id: Ic4b70fd8f565cda28e23fe6b1da0e278f949373c
Closes-Bug: #1256738
Closes-Bug: #1256737
Closes-Bug: #1257274