Merge branch '5948-add-redirect-to-https-for-ispconfig-interface-by-000-ispconfig-vhost-in-apache2' into 'develop'

Resolve "add redirect to https for ispconfig interface by 000-ispconfig.vhost in apache2"

Closes #5948

See merge request ispconfig/ispconfig3!1574

Author: Marius Burkard

install/tpl/apache_ispconfig.vhost.master

@@ -112,4 +112,8 @@ NameVirtualHost *:<tmpl_var name="vhost_port">
   <tmpl_var name="ssl_comment">SSLStaplingResponderTimeout 5
   <tmpl_var name="ssl_comment">SSLStaplingReturnResponderErrors Off
   </tmpl_if>
+
+  # Redirect http to https
+  ErrorDocument 400 "<script>document.location.href='https://'+location.hostname+':'+location.port';</script><h1>Error 400 - trying to redirect</h1>"
+
 </VirtualHost>