Make zsh completion work when ps output is custom
Make zsh completion work when ps output is custom

When `psFormat` is used in the docker client config json, if the output
is non-standard it breaks some of the completion handling for
containers.

This fixes that by ensuring that calls to `ps` use the default/standard
formatting by calling `docker ps --format 'table'`

Signed-off-by: Brian Goff <dc73d0991b982a8303e713ef531a313af77e242a@gmail.com>

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