Includes adding per-conversation data to store whether we are over
DTLS or UDP and registering as a heuristic sub-dissector for DTLS.
Future changes will add more use of the conversation structure.
Also included is a capture of UDT over DTLS in test/captures/udt-dtls.pcapng.gz,
the associated private key for the session in test/keys/udt-dtls.key and a
new test in the decryption suite to check this works.
Change-Id: I76826d3b35768d0b58f5335063884616968e5784
Reviewed-on: https://code.wireshark.org/review/22533
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>
