A hack to make dbclient to tcp forwarding netcat style.

eg

./dbclient -i testkey -L 1234:remotehost:remoteport  tunnelhost

will ssh to tunnelhost (using testkey, there's no way to ask for a password)
and then tcpfwd to remotehost:remoteport on stdin/stdout.

There's no way to give a cmdline password, so -i for a keyfile will have to do.
Yet another reason for agent forwarding.

The 1234 is a dummy var, I think it has to be a valid portnumber though.

--HG--
branch : dbclient-netcat-alike
extra : convert_revision : d1f69334581dc4c35f9ca16aa5355074c9dd315d