_PATH_LOGIN -> LOGIN_PATH that defaults to /usr/athena/bin/login
_PATH_LOGIN -> LOGIN_PATH that defaults to /usr/athena/bin/login

Better support for Solaris


git-svn-id: 193148810cf65385f3a195dbc9a8b504846da3a2@70 ec53bebd-3082-4978-b11e-865c3cabbd6b

madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal