After being hit by "why is openib not working?" ''again'', add a

verbose statement that shows up when you --mca btl_base_verbose 100.
It clearly states that the openib BTL disqualifies itself when
MPI_THREAD_MULTIPLE is used.

This commit was SVN r24209.

ompi/mca/btl/openib/btl_openib_component.c

@@ -2382,6 +2382,7 @@ btl_openib_component_init(int *num_btl_modules,
 
     /* Currently refuse to run if MPI_THREAD_MULTIPLE is enabled */
     if (ompi_mpi_thread_multiple && !mca_btl_base_thread_multiple_override) {
+        BTL_VERBOSE(("openib BTL disqualifying itself because MPI_THREAD_MULTIPLE is being used"));
         goto no_btls;
     }