Log pathname arguments to ftp commands as the user specified them;

Log pathname arguments to ftp commands as the user specified them;
add the working directory pathname to the log message if any of
such arguments isn't absolute.  This has advantage over the old
way of logging that an admin can see what users are actually trying
to do, and where.  The old code was also not too robust when it
came to a chrooted session and an absolute pathname.

Pointed out by: Nick Leuta
MFC after:      2 weeks