Fix cluster/admin handle behavior

- Disable CCCP when using an admin handle
- lcb_get_bootstrap_status should return success if there is a REST
  connection (only for config handles), since an actual vBucket config
  is never received for these.

Change-Id: I22719564189f94a673321720dae85ef7e8ecea44
Reviewed-on: http://review.couchbase.org/38099
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>