Bump log level on missing xerror causing client disconnect
Bump log level on missing xerror causing client disconnect

Change-Id: I51a558f40476edc3d43e60fe5e5777f04816d75d
Reviewed-on: http://review.couchbase.org/74255
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Jim Walker <1cd02e31b43620d7c664e038ca42a060d61727b9@couchbase.com>

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