Added columns for policyd in spamfilter_policy table.

Till Brehm

2014-01-22 08462d0f49737d258ecd9d1010c2e510534a62d8

 install/sql/incremental/upd_0050.sql

New file
@@ -0,0 +1,2 @@
ALTER TABLE `dns_slave` DROP INDEX `origin`;
ALTER TABLE `dns_slave` ADD CONSTRAINT `slave` UNIQUE (`origin`,`server_id`);