nmbd_incomingdgrams.c: Fix for typo.

nmbd_incomingdgrams.c: Fix for typo.
nmbd_sendannounce.c: Remote announcement was announcing to the wrong name !
nmblookup.c: Fix for substitutions not seeing hostname.
testparm.c: Fix for substitutions not seeing hostname.
wsmbstatus.c: Fix for substitutions not seeing hostname.
util.c: Change read_udp_socket to use sockaddr_in rather than dubiously
messing around with an opaque data type (sockaddr).
Jeremy.