Fixing MXM Yalla and MTL add procs behavior. MXM cannot support dynamic add procs, so propaget this info to the MTL and PML layers.

ompi/mca/mtl/mxm/mtl_mxm.c

@@ -390,6 +390,9 @@ int ompi_mtl_mxm_module_init(void)
     /* Register the MXM progress function */
     opal_progress_register(ompi_mtl_mxm_progress);
     
+    ompi_mtl_mxm.super.mtl_flags |= MCA_MTL_BASE_FLAG_REQUIRE_WORLD;
+
+
 #if MXM_API >= MXM_VERSION(2,0)
     if (ompi_mtl_mxm.using_mem_hooks) {
         opal_mem_hooks_register_release(ompi_mtl_mxm_mem_release_cb, NULL);

ompi/mca/pml/yalla/pml_yalla.c

@@ -185,6 +185,8 @@ int mca_pml_yalla_init(void)
 
     opal_progress_register(mca_pml_yalla_progress);
     
+    ompi_pml_yalla.super.pml_flags |= MCA_PML_BASE_FLAG_REQUIRE_WORLD;
+
     PML_YALLA_VERBOSE(2, "created mxm context %p ep %p", (void *)ompi_pml_yalla.mxm_context,
                       (void *)ompi_pml_yalla.mxm_ep);
     return OMPI_SUCCESS;