[krbdev.mit.edu #458] ftp should use gethostbyaddr() to get canonical service princ.

[Ken Raeburn via RT]

Still a serious issue, but not limited to ftp.  Eventually we will be
moving away from canonicalization of the names on the client side, so
changes to ftp in this area would have to be undone later.  And Sam is
looking at introducing a config file option in the short term which
would stop the name->addr->name silliness, and just do one round of
CNAME RR processing.

Unless these changes wind up not happening soon, leave this pending for
now.