Add StatsFormat to the config.json file
Add StatsFormat to the config.json file

As for `ps`, `images`, `network ls` and `volume ls`, this makes it
possible to define a custom default format.

Signed-off-by: Vincent Demeester <87e1f221a672a14a323e57bb65eaea19d3ed3804@sbr.pm>

thaJeztah/cli,allencloud/cli,e11137/cli,redpanda/cli,Zebrilee/cli,dnephin/cli,allencloud/cli,docker/cli,thaJeztah/cli,ashfall/cli,dnephin/cli,cpuguy83/cli,docker/cli,cpuguy83/cli,Zebrilee/cli,redpanda/cli,ashfall/cli,riyazdf/cli,gdevillele/cli,riyazdf/cli,e11137/cli