MB-100: fix load to memcached bucket

Change-Id: I68bfaa56e5a96e07d9d1298ba9636c7d0647e0bc
Reviewed-on: http://review.couchbase.org/25159
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>