Before 4bafaa00aa, if the daemon was
killed while a container was running and the container shim is killed
before the daemon is restarted, such as if the host system is
hard-rebooted, the daemon would restore the container to the stopped
state and set the exit code to 255. The aforementioned commit introduced
a regression where the container's exit code would instead be set to 0.
Fix the regression so that the exit code is once against set to 255 on
restore.
Signed-off-by: Cory Snider <csnider@mirantis.com>