This moves the call to sort in daemon/history to a function to be called explicitly when we're done adding elements to the list. This speeds up `docker ps`. Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack) Upstream-commit: e963179c790ec49b28fae0d7ebc0d9d2b3ac0b72 Component: engine