ext-respondd: dynamically configure fastd interface name

roles/localgw/tasks/respondd.yml

@@ -24,9 +24,9 @@
       batman: "{{ mesh_client_interface_name }}"
       bridge: "{{ client_bridge_name }}"
       mesh-vpn: 
-        - mesh-vpn
+        - "{{ fastd_interface }}"
       mesh-wlan: []
-      fastd_socket: "/var/run/fastd.mesh_vpn.socket"
+      fastd_socket: "/var/run/fastd.{{ fastd_interface }}.socket"
       rate_limit: 30
       rate_limit_burst: 10
   notify: