blackhole_logger is only used from the test suite
blackhole_logger is only used from the test suite

Change-Id: I6b1170be4e9bca8e94da81a97457122a2142acce
Reviewed-on: http://review.couchbase.org/56317
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

couchbase/memcached,couchbase/memcached,daverigby/memcached,couchbase/memcached,daverigby/memcached,daverigby/memcached,daverigby/memcached,couchbase/memcached,daverigby/kv_engine,daverigby/kv_engine,owendCB/memcached,owendCB/memcached,daverigby/kv_engine,owendCB/memcached,daverigby/kv_engine,owendCB/memcached