This fix tries to address the issue raised in 27189 where
it is not possible to support configured formatting stored in
config.json.
Since `--format` was not supported in `docker service ps`,
the flag `--format` has also been added in this fix.
This fix
1. Add `--format` to `docker service ps`
2. Add `tasksFormat` to config.json
3. Add `--format` to `docker stack ps`
4. Add `--format` to `docker node ps`
The related docs has been updated.
An integration test has been added.
This fix fixes 27189.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
