Bodhi 2.2.2 released

This is another in a series of bug fix releases for Bodhi this week. In this release, we've fixed
the following issues:

• Disallow comment text to be set to the NULL value in the database
  #949.
• Fix autopush on updates that predate the 2.2.0 release
  #950.
• Don't wait on mashes when there aren't any
  68de510c.