etcd/etcdserver
Yicheng Qin 2e41b4f9e1 etcdserver/auth: fix return value when creating root user
Before:

```
$ curl http://127.0.0.1:4001/v2/auth/users/root -XPUT -d '{"user": "root",
"password": "root"}'
{"user":"root","roles":null}
```

After:

```
{"user":"root","roles":["root"]}
```
2015-06-27 23:16:54 -07:00
..
2015-03-25 10:14:35 -07:00
2015-06-11 14:22:14 -07:00
2015-06-09 13:53:07 -07:00
2015-06-24 12:42:40 -07:00
2015-06-25 09:58:36 -07:00
2015-06-09 13:53:07 -07:00