Say that "the client driver may require an upgrade" in warning message for deprecated op codes in 5.0

Although the deprecated op codes (OP_QUERY, OP_INSERT, etc.) will still work in 5.0, they will stop working upon upgrade to 5.1 or later. Applications using old drivers that are producing this warning message should be encouraged to upgrade the driver. The work for this ticket is to augment the warning message in the logs to include the sentence "The client driver may require an upgrade to ensure compatibility with future server versions."