To actually use UCX as BTL, instead of verbs

Golden_Repo/o/OpenMPI-settings/OpenMPI-settings-4.1-UCX-CUDA.eb

@@ -21,7 +21,7 @@ modextravars = {
     'OMPI_MCA_mpi_param_check': '1',
     'OMPI_MCA_mpi_show_handle_leaks': '1',
     'OMPI_MCA_mpi_warn_on_fork': '1',
-    'OMPI_MCA_btl': 'self,vader,openib',
+    'OMPI_MCA_btl': 'self,vader,uct',
     'OMPI_MCA_btl_openib_allow_ib': '1',
     'OMPI_MCA_bml_r2_show_unreach_errors': '0',
     'OMPI_MCA_coll': '^ml',