fix typos in help and make more general

This commit was SVN r2473.

test/mca/llm/base/run_tests

@@ -22,13 +22,29 @@ umask 007
 
 if ("x$1" == "x") then
   ./parse_hostfile;
-else if ("$1" == "parse_hostfile") then
+else 
-  ./parse_hostfile;
+  foreach target ($argv)
-else
+    switch ($target)
-  echo "correct use: "
+    case "all"
-  echo "    run    (to run all class tests)"
+      ./parse_hostfile
-  echo "or  run < parse_hostfile >"
+      breaksw
-  exit -1
+    case "parse_hostfile":
+      ./$target
+      breaksw
+    case "help":
+      echo "correct use: "
+      echo "    run_tests help (this message)"
+      echo "    run_tests all   (to run all class tests)"
+      echo "or  run_tests < parse_hostfile >"
+      break
+      breaksw
+    default:
+      echo "There is no test program <$target> to run."
+      echo "    run_tests all   (to run all class tests)"
+      echo "or  run_tests < parse_hostfile >"
+      break
+    endsw
+  end
 endif