ipatests: check that ipa-client-automount restores nsswitch.conf at uninstall time
    
    Check that using ipa-client-install, ipa-client-automount --no-ssd, then uninstalling
    both properly restores nsswitch.conf sequentially.
    
    Related-to:: https://pagure.io/freeipa/issue/8038
    Signed-off-by: François Cami <fcami@redhat.com>
    Reviewed-By: Francois Cami <fcami@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Rob Critenden <rcritten@redhat.com>
    Reviewed-By: François Cami <fcami@redhat.com>