Handle unimplemented errinfo functions in inferior engines.
Handle unimplemented errinfo functions in inferior engines.

Change-Id: I340651c08895cb4e2d0542ca73e90ea49d131968
Reviewed-on: http://review.northscale.com/1727
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

membase/bucket_engine,membase/bucket_engine,membase/bucket_engine,couchbase/bucket_engine,membase/bucket_engine,couchbase/bucket_engine,couchbase/bucket_engine,couchbase/bucket_engine