Apply tags to systemd_service include

In order to be able to use tags to run systemd_service role solely,
they must be applied properly when role is included.

Change-Id: I121167e87b7aa68a75af17cbde084de5b1961264

tasks/glance_install.yml

@@ -140,6 +140,10 @@
 - name: Run the systemd service role
   include_role:
     name: systemd_service
+    apply:
+      tags:
+        - glance-config
+        - systemd-service
   vars:
     systemd_user_name: "{{ glance_system_user_name }}"
     systemd_group_name: "{{ glance_system_group_name }}"