alljoyn: Rename some filters; Fix some filter types.

Details:
 - Rename various "alljoyn.header..." display filter
    names releated to the alljoyn "message header"
    to "alljoyn.mess_header..." to distinguish
    the fields from actual alljoyn "header" fields.
    This also fixes the duplicate use of the display
    filter name "alljoyn.header".
 - Don't use FT_PROTOCOL for a field type.

Change-Id: Id4e78f36716cf6064638aecd5faf561bcbc88b46
Reviewed-on: https://code.wireshark.org/review/5561
Petri-Dish: Bill Meier <wmeier@newsguy.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Joe Huffman <jhuffman@codeaurora.org>
Reviewed-by: Bill Meier <wmeier@newsguy.com>