9272: Fix up state transitions:

9272: Fix up state transitions:

* Change state to Running only at the last possible moment before
  starting the container.

* When erroring out before Running, change state back to Queued.

* Do not save log/output/exit code when changing state to Cancelled.

Incidental fixes:

* Clean up error handling in Run()

* Don't create a collection for (or try to attach to the container)
  the second "cleanup activities" log that gets opened after closing
  the real container log.