Remove legacy include for manual special network config values.

Signed-off-by: Maximilian Wilhelm <max@rfc2324.org>

network/interfaces/interfaces.tmpl

@@ -34,13 +34,6 @@ iface lo
 {%- endfor %}
 
 
-{#
- # Special static config for this node?
-{%- set host_config_file = "network/interfaces/hosts/" ~ node_id ~ ".cfg" %}
-{%- include host_config_file ignore missing %}
- #}
-
-
 {#
  # Set up ifaces dict with configured and generated interfaces.
  #}