generate config yaml file instead of long extra-vars parameter
fix var and typo
leave extraVars for maas use

Change-Id: Ia4d535a738c6ee1fab99c35879407785a0b08458
diff --git a/scripts/cord-in-a-box.sh b/scripts/cord-in-a-box.sh
index f34aaba..3d7e838 100755
--- a/scripts/cord-in-a-box.sh
+++ b/scripts/cord-in-a-box.sh
@@ -187,7 +187,7 @@
       echo "    $0 -c             cleanup from previous test"
       echo "    $0 -d             run diagnostic collector"
       echo "    $0 -h             display this help message"
-      echo "    $0 -n             number of compute nodes to setup. currently max 2 nodes can be supported"
+      echo "    $0 -n #           number of compute nodes to setup. Currently max 2 nodes can be supported"
       echo "    $0 -s             run initial setup phase only (don't start building CORD)"
       echo "    $0 -t             do install, bring up cord-pod configuration, run E2E test"
       echo "    $0 -v             print CiaB version and exit"