removed power-dns from installer

Florian Schaal

2016-04-10 460a6091dab74e16ff2ad99aaaaf85c54f01894f

 install/sql/incremental/upd_0052.sql

New file
@@ -0,0 +1 @@
ALTER TABLE `client` ADD `default_slave_dnsserver` INT( 11 ) UNSIGNED NOT NULL DEFAULT '1' AFTER `limit_dns_zone`;