python-tornado: update to top of 2.2 branch

Drags in a few bugfixes needed for gateone

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
gateone: fix html5 feature check

The BlobBuilder and Blob checks never succeeded, even on cutting edge browsers. Nudge SRCREV forward to drag in those fixes.

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>