roles/nginx: no tag on service and server_name explicit

Do not apply tag `packages` to role `service`. Tags are already
applied inside the role. If we apply the tag `package` at the role
level handlers defined inside the role (restart, reload) are not
available in the play!

roles/nginx/tasks/main.yaml

@@ -5,8 +5,6 @@
     service_name: 'nginx'
     service_packages:
       - 'nginx'
-  tags:
-    - 'packages'
 
 - name: 'disable nginx default configuration'
   file:

roles/nginx/templates/base.j2

@@ -12,6 +12,8 @@ server {
     real_ip_header proxy_protocol;
 {% endif %}
 
+    server_name {{ server_fqdn }};
+
     # Do not advertise nginx version number
     server_tokens off;