This allows the job's status code to be consumed externally so that we
can use it as an exit code or saving to a state file.
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Upstream-commit: f90029611fec082a41b5629e43a88a39f0674fe2
Component: engine