Some SQL fixes for MariaDB compatibility. @see commit 9a8de140c82d0db44ac6...

Marius Cramer

2014-03-25 c2522876ff6f3d8707bd82882b88dc4f480c3e72

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ALTER TABLE `dns_slave` DROP INDEX `origin`;
ALTER TABLE `dns_slave` ADD CONSTRAINT `slave` UNIQUE (`origin`,`server_id`);