Bluetooth: RFCOMM: Fix recognizing services

Add support for missing direction flag in dlci.

Change-Id: I1429eb65374014e7b840bb31ca1d6f2ab1959160
Reviewed-on: https://code.wireshark.org/review/3766
Reviewed-by: Michal Labedzki <michal.labedzki@tieto.com>
Bluetooth: Fix Delete opcode in Linux Monitor transport

-1 -> tvb_captured_length(tvb) fixed zero-length packet.

Change-Id: I0748fa4e29d91a098f6222d162bce3177b9306e7
Reviewed-on: https://code.wireshark.org/review/3767
Reviewed-by: Michal Labedzki <michal.labedzki@tieto.com>