NCBC-212: Don't swallow StatusCode in ExecuteRemove

Change-Id: I003574744a051d78385ad13d8053aa9bb650438f
Reviewed-on: http://review.couchbase.org/24312
Reviewed-by: Saakshi Manocha <saakshi.manocha@globallogic.com>
Tested-by: Saakshi Manocha <saakshi.manocha@globallogic.com>