MB-10114: Don't remove items for allocation failures

The client should perform the appropriate operation

Change-Id: Ie83ab8c4420d0cdbb1d33d2b4daf5c65888b55dd
Reviewed-on: http://review.couchbase.org/33176
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>