Filter containers by status.

A continuation of #7616.
Closes #7616.
Adds `docker ps --filter=status=(restarting|running|paused|exited)` option.

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
yes so sorry I had a paused test as well at some point and missed this on changing it, I'm going to actually devote some time to this so as not to look over anything else from all the changes.