Follow-up to https://issues.redhat.com/browse/AAH-1437 (https://github.com/ansible/galaxykit/pull/51) which adds `galaxykit task wait <id>`.

Some API calls don't wait for the action they triggered to be finished, returing a task href instead.
Galaxykit then finishes when the task is created, instead of completed.

Proposed resolution:

• go through galaxykit commands, see which ones return a task
• add a `--wait` option to these, calling `tasks.wait_task(client, task_id_or_href)` instead of returning