Fix tripleo-hieradata role name in Barbican deployment

The cherry-pick that added Luna SA support to Barbican as a backend to this
branch uses the master branch name "tripleo_hieradata" to execute this role,
but the role name for the stable/train branch uses a dash instead of an
underscore.  i.e. tripleo-hieradata instead of tripleo_hieradata.

Change-Id: Ie27fd057fdf2019a80a1ca6cca68d1291488a857

deployment/barbican/barbican-api-container-puppet.yaml

@@ -487,7 +487,7 @@ outputs:
 
                   - name: set the slot id in hieradata
                     include_role:
-                      name: tripleo_hieradata
+                      name: tripleo-hieradata
                       tasks_from: ansible_hieradata.yml
                     vars:
                       hieradata_ansible_data: