This slipped through the auto->image change made in the course of preparing #538. Signed-off-by: Michael Bridgen <michael@weave.works>
This means all the sub-subcommands can drop the `image-` prefix, making them shorter and more fluent. E.g., flux create image policy rather than flux create auto image-policy Signed-off-by: Michael Bridgen <michael@weave.works>
