Zhang Wei 87f6d1f046 Bug fix: docker run -i --restart always hangs.
e.g.
```
$ docker run -i --restart always busybox sh
pwd
/
exit 11

<...hang...>
```

This is because Attach(daemon side) and Run(client side) both hangs on
WaitStop, if container is restarted too quickly, wait won't have chance
to get exit signal.

Signed-off-by: Zhang Wei <zhangwei555@huawei.com>
Upstream-commit: c498d4700df8216ccefd6d2f03b5ebe6d6e9fd47
Component: engine
2016-06-06 10:16:07 +08:00
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