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 <cpuguy83@gmail.com> Upstream-commit: ba3f8a9fefc9da16dc00cf01f2b1d32ec54ce20d Component: engine