Merge branch 'jnorell-develop-patch-62006' into 'develop'

Default to 2048 dkim_strength.

See merge request ispconfig/ispconfig3!1450

Author: Marius Burkard

install/tpl/server.ini.master

@@ -37,7 +37,7 @@ maildir_path=/var/vmail/[domain]/[localpart]
 homedir_path=/var/vmail
 maildir_format=maildir
 dkim_path=/var/lib/amavis/dkim
-dkim_strength=1024
+dkim_strength=2048
 content_filter=amavis
 rspamd_password=
 rspamd_redis_servers=127.0.0.1