* starting with filtering for exit codes. `docker ps -a --filter 'exited=1'` * API doc for filter parameter * formatting filters for help usage * tweaks for review This requires https://github.com/dotcloud/docker/pull/4430 Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts) Upstream-commit: 84146719d8b8322e302e7a0250fe8a3ee1a4edcd Component: engine