Merge branch 'master' into 'stable-3.1'

Marius Burkard

2016-03-14 80c6a7f559ceb100b82921019bab3a0c5ed2ae2a

 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`;