add rebuild makefile target and rebuild script

Change-Id: Id956c1693d0d29ca79e2483f37a048b47b3731bd
diff --git a/cord-pod/Makefile b/cord-pod/Makefile
index f98893d..6fba6c0 100644
--- a/cord-pod/Makefile
+++ b/cord-pod/Makefile
@@ -102,6 +102,10 @@
 
 new-nodes: clean-nodes update-nodes vtn
 
+rebuild:
+	bash ../common/rebuild.sh $(XOS_BOOTSTRAP_PORT)
+	bash ../common/wait_for_onboarding_ready.sh 81 xos
+
 exampleservice: onboard-exampleservice
 	$(RUN_TOSCA) pod-exampleservice.yaml