ompi/dpm: fix opal_show_help() message

This message was originally part of ORTE/ESS, but has since moved to
PRTE.  So replicate (and adapt) the help message to help-dpm.txt.

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

Author: jsquyres

ompi/dpm/dpm.c

@@ -10,7 +10,7 @@
  *                         University of Stuttgart.  All rights reserved.
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
- * Copyright (c) 2007-2020 Cisco Systems, Inc.  All rights reserved.
+ * Copyright (c) 2007-2022 Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2006-2009 University of Houston.  All rights reserved.
  * Copyright (c) 2009      Sun Microsystems, Inc.  All rights reserved.
  * Copyright (c) 2011-2015 Los Alamos National Security, LLC.  All rights
@@ -2069,7 +2069,7 @@ static int start_dvm(char **hostfiles, char **dash_host)
         execv(cmd, args);
 
         /* if I get here, the execv failed! */
-        opal_show_help("help-ess-base.txt", "ess-base:execv-error",
+        opal_show_help("help-dpm.txt", "execv-error",
                        true, cmd, strerror(errno));
         exit(1);
 

ompi/dpm/help-dpm.txt

@@ -1,6 +1,7 @@
 # -*- text -*-
 #
 # Copyright (c) 2020      Intel, Inc.  All rights reserved.
+# Copyright (c) 2022      Cisco Systems, Inc.  All rights reserved.
 # $COPYRIGHT$
 #
 # Additional copyrights may follow
@@ -44,3 +45,20 @@ the number of procs for each resource and the type of resource to be used.
   Specified value:  %s
 
 We are not able to proceed. Please correct your application.
+#
+[execv-error]
+
+The singleton application was not able to find an executabe in your
+PATH or in the directory where PRTE was initially installed, and
+therefore cannot continue.
+
+For reference, we tried the following command:
+
+  %s
+
+and got the error %s.
+
+This could mean that your PATH or executable name is wrong, or that
+you do not have the necessary permissions.  Please ensure that the
+executable is able to be found and executed as it is required for
+singleton operations.