Actually update to tornado 2.2.0.

This is the v2.2.0 tag in git://github.com/facebook/tornado, ie.
commit id 02bc76155de5bf4dca243e4d0c019c0ac4c8b3be .  I'm not sure
exactly which version was imported previously, but it wasn't quite this one.
The good news is it doesn't affect the tornado source code, just a bunch of
supporting files we don't really use.

* commit '3f6c64ca9fda3b2bf3f8ca3acb47b3d8cb255cbf':
  Squashed 'tr/vendor/tornado/' changes from 94078a6..3dd205c

Change-Id: I3a2ec0d6bf020e6d883126d1f3d96e10eefe9c6c
60 files changed