rgs1 / zk_shell / 263

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travis-ci

Display hosts in prompt

It seems nice to display the hosts in the prompt so the user knows what
hosts they're connected to - e.g.:

```
$ zk-shell $DOCKER_IP:2181
Welcome to zk-shell (1.1.1)
(CONNECTING [192.168.223.128:2181]) />
(CONNECTED [192.168.223.128:2181]) />

$ zk-shell
Welcome to zk-shell (1.1.1)
(DISCONNECTED) /> connect 192.168.223.128:2181
(CONNECTING []) />
(CONNECTED [192.168.223.128:2181]) /> disconnect

(DISCONNECTED) />
```

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