fix 多主集群下change_k8s_network时vip丢失问题

tools/change_k8s_network.yml

@@ -81,6 +81,12 @@
     - kube-proxy
     ignore_errors: true
 
+- hosts:
+  - lb
+  tasks:
+  - name: 重启lb的keepalived服务
+    service: name=keepalived state=restarted
+  
 - hosts:
   - kube-master
   - new-master