Ensure we get a non-zero exit status when we can't find the specified fork agent. Output a better error message, and ensure we don't multiply report the problem.

This commit was SVN r26191.

orte/mca/odls/base/help-orte-odls-base.txt

@@ -73,3 +73,11 @@ This is an error; your job will now abort.
   Local host:        %s
   Application name:  %s
   Action requested:  %s %s
+#
+[orte-odls-base:fork-agent-not-found]
+The specified fork agent was not found:
+
+  Node:        %s
+  Fork agent:  %s
+
+The application cannot be launched.

orte/mca/odls/base/odls_base_default_fns.c

@@ -1529,6 +1529,7 @@ int orte_odls_base_default_launch_local(orte_jobid_t job,
                                        "orte-odls-base:xterm-rank-out-of-bounds",
                                        true, nm->name.vpid, jobdat->num_procs);
                         rc = ORTE_ERR_VALUE_OUT_OF_BOUNDS;
+                        child->exit_code = ORTE_ERR_SILENT;
                         goto CLEANUP;
                     }
                     
@@ -1551,8 +1552,11 @@ int orte_odls_base_default_launch_local(orte_jobid_t job,
                 free(app->app);
                 app->app = opal_path_findv(orte_fork_agent[0], X_OK, orte_launch_environ, NULL);
                 if (NULL == app->app) {
-                    opal_output(0, "%s CANNOT FIND FORK AGENT %s", ORTE_NAME_PRINT(ORTE_PROC_MY_NAME), orte_fork_agent[0]);
-                    rc = ORTE_ERR_NOT_FOUND;
+                    orte_show_help("help-orte-odls-base.txt",
+                                   "orte-odls-base:fork-agent-not-found",
+                                   true, orte_process_info.nodename, orte_fork_agent[0]);
+                    rc = ORTE_ERR_SILENT;
+                    child->exit_code = ORTE_ERR_SILENT;
                     goto CLEANUP;
                 }
             }

orte/runtime/orte_quit.c

@@ -231,6 +231,9 @@ static void dump_aborted_procs(void)
                     return;
                 }
                 switch (proc->exit_code) {
+                case ORTE_ERR_SILENT:
+                    /* say nothing - it was already reported */
+                    break;
                 case ORTE_ERR_SYS_LIMITS_PIPES:
                     orte_show_help("help-orterun.txt", "orterun:sys-limit-pipe", true,
                                    orte_basename, proc->node->name,