Pierre-Yves David <pierre-yves.david@fb.com> [Sat, 29 Nov 2014 19:13:35 -0800] rev 23415
hook: raise a more specialized HookAbort exception when a hook fails
We need to gracefully handle some aborts for pushkey, especially
because it leads to a user-facing crash over the wireprotocols. So we
need a more specialized exception to catch.
mq: fix update of headers that occur in the "wrong" order
Mq tried to insert headers in the right order. Sometimes it would stop
searching before checking all headers and it could thus duplicate a header
instead of replacing it.