Apply haproxy-service-config tag on include

Rather then applying tag for each task inside the haproxy_service_config
file, it's better to apply it to include. Also, this closes the bug,
when role fails due to fact being undefined,
since setting fact was not covered by the tag.

Change-Id: I533070196dda5387a910f613cdd037fa36880cdb

tasks/haproxy_post_install.yml

@@ -54,6 +54,10 @@
 
 - name: Including haproxy_service_config tasks
   include_tasks: haproxy_service_config.yml
+  args:
+    apply:
+      tags:
+        - haproxy-service-config
   tags:
     - haproxy-service-config
 

tasks/haproxy_service_config.yml

@@ -49,8 +49,6 @@
     - (service.haproxy_service_enabled | default('True')) | bool
     - (service.state is not defined or service.state != 'absent')
   notify: Regenerate haproxy configuration
-  tags:
-    - haproxy-service-config
 
 - name: Remove haproxy service config files for absent services
   file:
@@ -65,8 +63,6 @@
   when:
     - ((service.haproxy_service_enabled | default('True')) | bool) is falsy or
       (service.state is defined and service.state == 'absent')
-  tags:
-    - haproxy-service-config
 
 ###########################################################################
 # Map files assembled from fragments from each service into <map-name>.map