roles/nginx: Use dynamic includes for tasks

As of Ansible 2.4 and 2.5 the behavior for importing tasks has changed
to introduce the notion of static imports and dynamic includes. If the
tasks doing the import is using variable interpolation or conditionals
then the task should be dynamic. This results in quicker playbook runs
due to less importing of unneccessary tasks.

One side effect of this is that child tasks of dynamic includes do not
inherit their parents' tags so you must tag them explicitly or a block.

roles/nginx/tasks/main.yml

@@ -35,7 +35,7 @@
   tags: nginx
 
 - name: Configure nginx virtual hosts
-  import_tasks: vhosts.yml
+  include_tasks: vhosts.yml
   when: nginx_vhosts is defined
   tags: nginx
 

roles/nginx/tasks/vhosts.yml

@@ -1,5 +1,6 @@
 ---
 
+- block:
   - name: Configure https vhosts
     template: src=vhost.conf.j2 dest={{ nginx_confd_path }}/{{ item.domain_name }}.conf mode=0644 owner=root group=root
     loop: "{{ nginx_vhosts }}"
@@ -35,5 +36,6 @@
   - include_tasks: letsencrypt.yml
     when: use_letsencrypt is defined and use_letsencrypt == True
     tags: letsencrypt
+  tags: nginx
 
 # vim: set ts=2 sw=2: