Do not remove docker-registry while cleaning up

Change-Id: Ic383c111fd39e9abedc45a331b134e919ea47543
diff --git a/seba-in-a-box/Makefile b/seba-in-a-box/Makefile
index 444d8da..b52bf35 100644
--- a/seba-in-a-box/Makefile
+++ b/seba-in-a-box/Makefile
@@ -241,7 +241,7 @@
 	cd $(M); rm -f qatests qatests-prereqs
 
 teardown-charts: remove-chart-milestones
-	helm delete --purge $(shell helm ls -q)
+	helm delete --purge $(shell helm ls -q | grep -v docker-registry)
 
 reset-kubeadm: remove-chart-milestones remove-kube-milestones remove-test-milestones
 	sudo kubeadm reset -f