Currently if we exec a restarting container, client will fail silently,
and daemon will print error that container can't be found which is not a
very meaningful prompt to user.
This commit will stop user from exec a restarting container and gives
more explicit error message.
Signed-off-by: Zhang Wei <zhangwei555@huawei.com>
Upstream-commit: 1d2208fed90da9ab72ded3b1c65bb2a71b66ce93
Component: engine