upup: increase etcd initialDelaySeconds

Otherwise a transient problem can put etcd into a restart loop, where
k8s backs off and a quorum of nodes won't exist simultaneously.

protokube/templates/etcd/manifest.template

@@ -43,7 +43,7 @@ spec:
         host: 127.0.0.1
         port: {{ .ClientPort }}
         path: /health
-      initialDelaySeconds: 15
+      initialDelaySeconds: 600
       timeoutSeconds: 15
     ports:
     - name: serverport