This renames the `--time` flag as used on `docker stop` and `docker restart`
to `--timeout`, bringing it in line with other uses for this property,
such as `--stop-timeout` on `docker run`.
The `--time` option is deprecated and hidden, but will be kept for
backward compatibility, as these options existed for a long time.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>