lldp: hopefully fix control structure

lldp/init.sls

-{%- set lldp = False -%}
+{%- set interfaces = [] -%}
 {%- for name, interface in pillar.ifaces.items() if 'lldp' in interface -%}
-  {%- set lldp = True -%}
+  {%- do interfaces.append(name) -%}
 {%- endfor -%}
-{%- if lldp -%}
+{%- if interfaces is iterable -%}
 lldpd:
   pkg.installed: []
   service.running:
@@ -27,5 +27,5 @@ purge-lldpd:
 
 purge-lldpd-default:
   file.absent:
-    - filename: /etc/default/lldpd
+    - name: /etc/default/lldpd
 {% endif %}