Remove some unused cruft in the dejagnu test suite's default.exp:

Remove some unused cruft in the dejagnu test suite's default.exp:
  * RLOGIN, RLOGIN_FLAGS, ROOT_PROMPT, ROOT_SHELL, check_k5login,
    restore_kerberos_env, setup_root_shell, setup_root_shell_noremote,
    setup_wrapper: No longer used now that the applications are in a
    separate tree.
  * v4_compatible_enctype: No longer used with krb4 support gone.
  * tail1, krb_exit: Apparently never used.
  * KERBEROS_SERVER: Added long ago in r5686 and removed shortly after
    in r5695, but the test suite support for it never got excised.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@23744 dc483132-0cff-0310-8789-dd5450dbe970