Update the show_help message for when there are not enough slots to
run an application.
Also, remove a bunch of copies of this message in various show_help
text files that aren't used/referred to anywhere in the code.
Signed-off-by: Jeff Squyres <jsquyres@cisco.com>
(cherry picked from commit 430c659908f9c1ba1ff652379a694314718ff3d8)
76d4c1843e