Settings: add opt out stats event

- Get rid of keeping track of queued jobs, job scheduler does this and
  all we really want is a new job id to not interfere with old ones
  (unless we hit the max jobs allowed, then start the count over).

- Persist whether we have reported metrics for the owner user (once per
  device)

Ref: CYNGNOS-1131
Change-Id: Ib5bac2944b5ca4259ea82a357b24708377c1dc4c