start unbound after installation

roles/nameserver/tasks/install_unbound.yml

@@ -11,4 +11,9 @@
     owner: "root"
     group: "root"
     validate: "unbound-checkconf %s"
-  notify: restart_unbound
+
+- name: nameserver | unbound | enable service
+  service:
+    name: "unbound"
+    state: started
+    enabled: True