use handler to restart powerdns

roles/nameserver/handlers/main.yml

@@ -12,3 +12,8 @@
   service:
     name: "unbound"
     state: restarted
+
+- name: restart_pdns
+  service:
+    name: "pdns"
+    state: restarted

roles/nameserver/tasks/install_powerdns_server.yml

@@ -55,6 +55,7 @@
   when:
     - powerdns_primary is defined
     - powerdns_primary is true
+  notify: restart_pdns
 
 - name: nameserver | powerdns-recursor | disable bind
   service: