MB-11711: Don't log get errors for failed meta only gets

Failures for these are expected since we are checking to see if a
deleted item exists. As a result these should not be logged.

Change-Id: I40825d6a3cb780b647be258faeb9bc5e3ae99095
Reviewed-on: http://review.couchbase.org/39356
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>