Merge branch '500-dev' into 'develop'

Don't tell bind software version

See merge request ispconfig/ispconfig3!1163

Author: Till Brehm

install/tpl/named.conf.options.master

@@ -21,6 +21,8 @@ options {
 	dnssec-enable yes;
 	dnssec-validation yes;
 	dnssec-lookaside auto;
+
+	version "unknown";
 
 	allow-transfer {none;};