r4891: - added a generic resolve_name() async interface in libcli/resolve/,

r4891:  - added a generic resolve_name() async interface in libcli/resolve/,
   which will eventually try all resolution methods setup in smb.conf

 - only resolution backend at the moment is bcast, which does a
   parallel broadcast to all configured network interfaces, and takes
   the first reply that comes in (this nicely demonstrates how to do
   parallel requests using the async APIs)

 - converted all the existing code to use the new resolve_name() api

 - removed all the old nmb code (yay!)
(This used to be commit 239c310f255e43dd2d1c2433f666c9faaacbdce3)