添加kubeadm介绍和Ubuntu环境下安装样例的章节

SUMMARY.md

@@ -121,7 +121,7 @@
   - [安装dashboard插件](practice/dashboard-addon-installation.md)
   - [安装heapster插件](practice/heapster-addon-installation.md)
   - [安装EFK插件](practice/efk-addon-installation.md)
-- [使用kubeadm快速测试集群](practice/install-kubernetes-with-kubeadm.md)
+- [使用kubeadm快速构建测试集群](practice/install-kubernetes-with-kubeadm.md)
   - [使用kubeadm在Ubuntu Server 16.04上快速构建测试集群](practice/install-kubernetes-on-ubuntu-server-16.04-with-kubeadm.md)
 - [服务发现与负载均衡](practice/service-discovery-and-loadbalancing.md)
   - [安装Traefik ingress](practice/traefik-ingress-installation.md)
@@ -222,4 +222,3 @@
   - [Kubernetes1.10更新日志](appendix/kubernetes-1.10-changelog.md)
 - [Kubernetes及云原生年度总结及展望](appendix/summary-and-outlook.md)
   - [Kubernetes与云原生2017年年终总结及2018年展望](appendix/kubernetes-and-cloud-native-summary-in-2017-and-outlook-for-2018.md)
-