* rcp (client mode) now uses rsh -x but still supports the old encryption in

* rcp (client mode) now uses rsh -x but still supports the old encryption in
     server mode.
* krshd will work in encrypting mode even when the port for stderr is null.
* rcp will work if stdin isn't not a socket, but is a pipe  in remote mode
* krshd destroys forwarded credentials properly
* For rsh, the secure_message got moved to the client; if you use a new client
     with an old server, you get secure_message twice, but it should be a
     useful change long-term.
* Fixed typo in rcp man page.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@7423 dc483132-0cff-0310-8789-dd5450dbe970