Run task

So I'm a little torn here about what to do.  `taskcluster run` and `taskcluster run-task` both end up here, but without --verbose being set (can't do with `taskcluster run` currently), there is no indication as to what's being done but a blank terminal.  While I don't want to overwhelm people with information that they don't want, I think at least letting them know the task was submitted would be a good indication.  Especially if it's submitted to a worker-type that is taking awhile to run tasks.  They could at least check the status in the task inspector if they had the task-id, which they can only find now with --verbose and can't get after they've submitted the task.

Just a thought.