Require a label to indicate ip-masq-agent readiness. This prevents

a daemonset running on nodes where the master is 1.7 and has this
enabled by default, however, the nodes are still < 1.7.

cluster/addons/ip-masq-agent/ip-masq-agent.yaml

@@ -33,6 +33,8 @@ spec:
         volumeMounts:
           - name: config
             mountPath: /etc/config
+      nodeSelector:
+        beta.kubernetes.io/masq-agent-ds-ready: "true"            
       volumes:
         - name: config
           configMap: