Take the name-processing part of "get_nbns_name_type_class()" and put it

Take the name-processing part of "get_nbns_name_type_class()" and put it
in "get_nbns_name()", and have "get_nbns_name_type_class()" call it.
Use "get_nbns_name()" rather than "get_nbns_name_type_class()" in the
NBDS code, as there aren't any type or class fields in an NBDS packet.

Show the data in an NBDS datagram as raw data.  (We don't have an SMB
parser yet.)

Don't dissect anything past the header if an NBDS packet is an unknown
packet type.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@117 f5534014-38df-0310-8fa8-9805f1628bb7