test_nfs.py historically used master_2repl_1client. Now that master_3client exists, switch to that as it allows removal of custom install/cleanup steps. Fixes: https://pagure.io/freeipa/issue/8027 Signed-off-by: François Cami <fcami@redhat.com> Reviewed-By: Sergey Orlov <sorlov@redhat.com> Reviewed-By: Rob Crittenden <rcritten@redhat.com>