Heads up: nfsuserd -use-udpsock option no longer used

As of r338192 the command line option "-use-udpsock" no longer exists,
since r320757 has been reverted.
The behaviour is now back to always using a UDP socket the same as stable/11.

In other words, if you are using the nfsuserd with the "-use-udpsock" option, just
get rid of the "-use-udpsock" option and you will still have that behaviour.

rick