Yicheng Qin 939aa96a34 etcdmain: improve log when join discovery fails ...

Before this PR, the log is

```
2015/09/1 13:18:31 etcdmain: client: etcd cluster is unavailable or
misconfigured
```

It is quite hard for people to understand what happens.

Now we print out the exact reason for the failure, and explains the way
to handle it.

2015-09-28 23:23:50 -07:00

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