One set of tests for whether a packet looks like a STUN2 packet

suffices; have the heuristic dissector call the message dissector and
return FALSE if the message dissector returns 0 (meaning it's not a
STUN2 packet) and TRUE otherwise.

New-style dissectors don't return a Boolean, they return 0 if the packet
isn't a packet for that protocol and the number of bytes dissected
otherwise.  (Yes, that's a problem if the length of the tvbuff handed to
the dissector is 0; that's why new-style dissectors aren't yet the
default.)

svn path=/trunk/; revision=26060

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