We use the start-stop-daemon pid creation mechanism in addition the intrinsic built into docker. This means the pid file is guaranteed to be written out by the time the script exits.
See #6184.
Docker-DCO-1.1-Signed-off-by: Joe Beda <joe.github@bedafamily.com> (github: jbeda)
Upstream-commit: c11fadb282ea7e96eef2280a5e422fd2c94e8c45
Component: engine