caddy-frontend: Drop obsoleted case

Empty extra_slave_instance_list is a leftover of never fully working approach
of slaveless caddy-frontend implementation, so just drop it.

software/caddy-frontend/buildout.hash.cfg

@@ -30,7 +30,7 @@ md5sum = 50dbd9bd25fbc608b576ac83f4e13b0f
 
 [profile-slave-list]
 filename = instance-slave-list.cfg.in
-md5sum = 5be5a32d5cf22e10967e59570dda2d36
+md5sum = aba91817a1b58377597500f676603d23
 
 [profile-master-publish-slave-information]
 filename = instance-master-publish-slave-information.cfg.in

software/caddy-frontend/instance-slave-list.cfg.in

@@ -376,22 +376,12 @@ config-frequency = 720
 {%-   endif %}
 
 {#-   ###############################  #}
-{#-   Publish Slave Information        #}
-{%-   if not configuration['extra_slave_instance_list'] %}
-{%-     set publish_section_title = 'publish-%s-connection-information' % slave_instance.get('slave_reference') %}
-{%-     do part_list.append(publish_section_title) %}
-[{{ publish_section_title }}]
-recipe = slapos.cookbook:publish
-{%-     for key, value in slave_publish_dict.items() %}
-{{ key }} = {{ value }}
-{%-     endfor %}
-{%-   else %}
-{%-     do slave_instance_information_list.append(slave_publish_dict) %}
+{#-   Prepare Slave Information        #}
+{%-   do slave_instance_information_list.append(slave_publish_dict) %}
+{%-   do frontend_slave_list.append(slave_instance) %}
+{%-   if slave_type != 'redirect' %}
+{%-     do backend_slave_list.append(slave_instance) %}
 {%-   endif %}
-{%-  do frontend_slave_list.append(slave_instance) %}
-{%-  if slave_type != 'redirect' %}
-{%-    do backend_slave_list.append(slave_instance) %}
-{%-  endif %}
 {%- endfor %} {# Slave iteration ends for slave_instance in slave_instance_list #}
 
 {%- do part_list.append('slave-introspection') %}