Set the default modex parameters back to full blocking modex while we continue to test and debug the slow modex - it seems to be having issues on the Cray

Signed-off-by: Ralph Castain <rhc@open-mpi.org>

ompi/runtime/ompi_mpi_params.c

@@ -287,7 +287,7 @@ int ompi_mpi_register_params(void)
                                  MCA_BASE_VAR_SCOPE_READONLY,
                                  &ompi_mpi_dynamics_enabled);
 
-    ompi_async_mpi_init = true;
+    ompi_async_mpi_init = false;
     (void) mca_base_var_register("ompi", "async", "mpi", "init",
                                  "Do not perform a barrier at the end of MPI_Init",
                                  MCA_BASE_VAR_TYPE_BOOL, NULL, 0, 0,

opal/mca/pmix/base/pmix_base_frame.c

@@ -39,7 +39,7 @@ opal_pmix_base_t opal_pmix_base = {0};
 
 static int opal_pmix_base_frame_register(mca_base_register_flag_t flags)
 {
-    opal_pmix_base_async_modex = true;
+    opal_pmix_base_async_modex = false;
     (void) mca_base_var_register("opal", "pmix", "base", "async_modex", "Use asynchronous modex mode",
                                  MCA_BASE_VAR_TYPE_BOOL, NULL, 0, 0, OPAL_INFO_LVL_9,
                                  MCA_BASE_VAR_SCOPE_READONLY, &opal_pmix_base_async_modex);