Revert r20128. Setting a default hostfile name breaks all the filtering code we added to the system. It would require multiple entries in several places to ensure that, should the default hostfile in fact not exist, the system will still work correctly.

Too much complexity - just put the name in the default mca param file iff you actually have a default hostfile.

This commit was SVN r20129.

The following SVN revision numbers were found above:
  r20128 --> open-mpi/ompi@ea01da0eee

orte/runtime/orte_mca_params.c

@@ -157,7 +157,7 @@ int orte_register_params(void)
     /* default hostfile */
     mca_base_param_reg_string_name("orte", "default_hostfile",
                                    "Name of the default hostfile (relative or absolute path)",
-                                   false, false, "openmpi-default-hostfile", &orte_default_hostfile);
+                                   false, false, NULL, &orte_default_hostfile);
     
     
     /* whether or not to keep FQDN hostnames */