kes Fix bug #462 incorrect error message printed when client script called

     from File= was not found.
kes  Fix bug #558 (waiting for feedback) where Bacula needs too much time to
     do a rewind on Solaris when no tape is in the drive (Solaris does not
     have the detailed errno found on Linux).  Added Solaris specific code.
     Note, this may apply to other OSes as well.