Qiang Huang 9a568f22f0 Fix race condition when exec with tty
I can reproduce this easily on one of my servers,
`docker exec -ti my_cont ls` will not print anything,
without `-t` it acts normally.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Upstream-commit: a444b5f60c75bdac82c9a7126738c210e2ccf941
Component: engine
2016-03-08 10:53:34 +08:00
S
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