Add in an opal_output_verbose() so that we'll see the case where there

are no usNICs found.

Refs trac:4549

This commit was SVN r31489.

The following Trac tickets were found above:
  Ticket 4549 --> https://svn.open-mpi.org/trac/ompi/ticket/4549

ompi/mca/btl/usnic/btl_usnic_component.c

@@ -515,6 +515,8 @@ static mca_btl_base_module_t** usnic_component_init(int* num_btl_modules,
                                 "btl:usnic: using L2-only transport");
         } else {
             /* There's no usNICs, so bail... */
+            opal_output_verbose(5, USNIC_OUT,
+                                "btl:usnic: no usNICs found");
             goto free_include_list;
         }
     }