Use legacy docker repository for kubernetes

Change-Id: I163160b437908b7af3bf6226ff4580bafbd7c47a
diff --git a/kubernetes/master/single.yml b/kubernetes/master/single.yml
index cc8d8ab..a546233 100644
--- a/kubernetes/master/single.yml
+++ b/kubernetes/master/single.yml
@@ -1,5 +1,6 @@
 classes:
 - service.kubernetes.master.single
+- system.linux.system.repo.docker_legacy
 parameters:
   _param:
     kubernetes_netchecker_agent_image: quay.io/l23network/k8s-netchecker-agent:v1.0