ipatests: xfail TestIpaClientAutomountFileRestore's final test
    
    Due to a change in authselect, rolling back the installation
    does not produce the same nsswitch.conf as on a clean install.
    Mark the test xfail until ipa-client-install is enhanced to
    use authselect profile backup/restore.
    
    Related: https://pagure.io/freeipa/issue/8189
    Signed-off-by: François Cami <fcami@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>