Propagate the error message from the server
Propagate the error message from the server

If the server starts to return an error we want to terminate
the process rather than continuing with a bigger value.

Change-Id: I972892e8f22db5c84c98515c24e6c8e7d7af9517
Reviewed-on: http://review.couchbase.org/49570
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

couchbase/memcached,cloudrain21/memcached-1,owendCB/memcached,couchbase/memcached,cloudrain21/memcached-1,daverigby/kv_engine,couchbase/memcached,daverigby/kv_engine,daverigby/memcached,daverigby/kv_engine,owendCB/memcached,daverigby/kv_engine,cloudrain21/memcached-1,owendCB/memcached,daverigby/memcached,couchbase/memcached,daverigby/memcached,cloudrain21/memcached-1,owendCB/memcached,daverigby/memcached