[zookeeper]连接虚拟机中的zookeeper是出现 timeout报错时的解决方案

报错的部分描述:

java.util.concurrent.TimeoutException: null
at java.util.concurrent.FutureTask.get(FutureTask.java:205)
at com.alibaba.dubbo.remoting.zookeeper.zkclient.ZkClientWrapper.start(ZkClientWrapper.java:51)
at com.alibaba.dubbo.remoting.zookeeper.zkclient.ZkclientZookeeperClient.(ZkclientZookeeperClient.java:39)
at com.alibaba.dubbo.remoting.zookeeper.zkclient.ZkclientZookeeperTransporter.connect(ZkclientZookeeperTransporter.java:10)
at com.alibaba.dubbo.remoting.zookeeper.ZookeeperTransporter$Adaptive.connect(ZookeeperTransporter$Adaptive.java)
at com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistry.(ZookeeperRegistry.java:69)
at com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistryFactory.createRegistry(ZookeeperRegistryFactory.java:37)
at com.alibaba.dubbo.registry.support.AbstractRegistryFactory.getRegistry(AbstractRegistryFactory.java:95)
at com.alibaba.dubbo.registry.RegistryFactory$Adaptive.getRegistry(RegistryFactory$Adaptive.java)

Caused by: java.lang.IllegalStateException: Zookeeper is not connected yet!
at com.alibaba.dubbo.remoting.zookeeper.zkclient.ZkClientWrapper.createPersistent(ZkClientWrapper.java:82)
at com.alibaba.dubbo.remoting.zookeeper.zkclient.ZkclientZookeeperClient.createPersistent(ZkclientZookeeperClient.java:45)
at com.alibaba.dubbo.remoting.zookeeper.support.AbstractZookeeperClient.create(AbstractZookeeperClient.java:47)
at com.alibaba.dubbo.remoting.zookeeper.support.AbstractZookeeperClient.create(AbstractZookeeperClient.java:41)
at com.alibaba.dubbo.remoting.zookeeper.support.AbstractZookeeperClient.create(AbstractZookeeperClient.java:41)
at com.alibaba.dubbo.remoting.zookeeper.support.AbstractZookeeperClient.create(AbstractZookeeperClient.java:41)
at com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistry.doRegister(ZookeeperRegistry.java:110)

问题描述：拔掉网线能连接上zookeeper;但是插上网线后不能连接zookeeper，出现(java.util.concurrent.TimeoutException: null)的错误。

解决方案:当判断是网络问题时，参考虚拟机的配置(https://my.oschina.net/u/3782515/blog/2051100)

并且将VMnet8网络配置成DHCP自动获取，如下图：(要将虚拟机重新配置一遍，这样就能完美解决问题了，自动获取的话，也仅仅只是本地

访问而已，不能联网)