Tag workflows created by the templates

This is useful to easily filter workflows created by the templates
and for a specific stack.

Change-Id: I0a26cacaf5ad5709881043434694c9254a9e710b
Related-Bug: #1715389

common/deploy-steps.j2

@@ -108,6 +108,9 @@ resources:
     properties:
       name: {list_join: [".", ["tripleo", {get_param: stack_name}, "workflowtasks", "step{{step}}"]]}
       type: direct
+      tags:
+      - tripleo-heat-templates-managed
+      - {get_param: stack_name}
       tasks:
         yaql:
           expression: $.data.where($ != '').select($.get('step{{step}}')).where($ != null).flatten()