ZooKeeper input plugin doesnt't write any metrics if first zookeeper node failed

[vbeskrovnov]

Bug report

Relevant telegraf.conf:

[[inputs.zookeeper]]
## An array of address to gather stats about. Specify an ip or hostname
## with port. ie localhost:2181, 10.0.0.1:2181, etc.

## If no servers are specified, then localhost is used as the host.
## If no port is specified, 2181 is used
servers = ["zookeeper-1:2181", "zookeeper-2:2181", "zookeeper-3:2181"]

System info:

Telegraf image: telegraf:1.2.1-alpine

Steps to reproduce:

1. Start three nodes of zookeeper
2. Start telegraf service
3. Turn off first zookeeper node(zookeeper-1:2181).

Expected behavior:

Telegraf will continue to write metrics of two nodes

Actual behavior:

Telegraf doesn't write any metrics

Additional info:

2017-12-06T09:27:53Z E! ERROR in input [inputs.zookeeper]: dial tcp 172.30.116.142:2181: getsockopt: no route to host
Where 172.30.116.142:2181 is IP of first zookeeper nodee(zookeeper-1:2181)

[vbeskrovnov]

This issue was fixed in PR #2372 and issue #1446. So this issue can be closed.