Pass the container's command via args
Remove execin function and just look for an
existing nspid file to join the namespace
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Upstream-commit: d84feb8fe5e40838c81321249189f1f0a02825bb
Component: engine