fixup! caddy-frontend: Publish only active slaves from main partition

slave_title is dangerous, as it can contain any characters; it supposed
to be slave_reference.

software/caddy-frontend/buildout.hash.cfg

@@ -26,7 +26,7 @@ md5sum = 6fd023f0d29421d8579f0b3351473bb0
 
 [template-apache-replicate]
 filename = instance-apache-replicate.cfg.in
-md5sum = 15d6b5b00ab1f74d42863c90f2537981
+md5sum = ecbf3506fc8c8dde72d64fd61d286483
 
 [template-slave-list]
 filename = templates/apache-custom-slave-list.cfg.in

software/caddy-frontend/instance-apache-replicate.cfg.in

@@ -227,7 +227,7 @@ custom-group = ${dynamic-publish-slave-information:rendered}
 {% for slave_instance in slave_instance_list %}
 {# Provide a list of slave titles send by master, in order to filter out already destroyed slaves #}
 {# Note: This functionality is not yet covered by tests, please modify with care #}
-{{ slave_instance['slave_title'] }} = active
+{{ slave_instance['slave_reference'] }} = active
 {% endfor %}
 
 [dynamic-publish-slave-information]