MB-20598: AddressSanitizer problem in memcached
MB-20598: AddressSanitizer problem in memcached

There's a out of bound access problem in configuring ewouldblock engine.
First memcpy size is incorrect.

Change-Id: I2236ec1551cbd55b7f3243b6a6b16c7c2a367733
Reviewed-on: http://review.couchbase.org/67060
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Reviewed-by: Will Gardner <cbd6f5d9092d9ef7d5c0510d53bba134b22c02f2@couchbase.com>
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

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