After r219579 and r219779 unbreak v4-mapped v6 sockets for UDP some more.  Similar to what we do for TCP check for v4-mapped addresses and then handle them or the normal v6 address case. For either set inp_vflags before calling into the pcb connect function so that we have an unambiguous view in case we need to set the local address or port.
After r219579 and r219779 unbreak v4-mapped v6 sockets for UDP
some more.  Similar to what we do for TCP check for v4-mapped
addresses and then handle them or the normal v6 address case.
For either set inp_vflags before calling into the pcb connect
function so that we have an unambiguous view in case we need to
set the local address or port.

Looked at:	tuexen (as part of more)
MFC after:	3 days

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase