SMB2: try to guess encryption settings when not available

When dissecting a capture made in the middle of an existing encrypted
session we cannot decrypt the traffic because we don't know:

* what SMB dialect and encryption algorithm was picked during the
  session establishment
* which host is the server and which host is the client

Since we know the decrypted payload always starts with a valid header
we use this as an heuristic and try all possible decryption settings.

Change-Id: I1daa297ced98e62cf361b9022871c668e56f8f4b
Reviewed-on: https://code.wireshark.org/review/36136
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>

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