Add cbauth to Sherlock and Askeladden

Change-Id: I8fd69219bf247c0f4f8b8695da679a71cd0b7e8d
Reviewed-on: http://review.couchbase.org/44175
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>