Add ability to build images to baremetal playbook

This is the last step to be able to use the same playbook in
all cases for OVB jobs. We default it inline to false, so that
there is no behavior change for actual baremetal jobs.

Change-Id: I70310bf09f181bacf0fc4956cb9be61e4cb4a976

playbooks/baremetal-quickstart-extras.yml

@@ -23,6 +23,15 @@
     - { role: tripleo-validations,
         when: run_tripleo_validations|bool or run_tripleo_validations_negative_tests|bool}
 
+- name: Build images for quickstart
+  hosts: undercloud
+  gather_facts: no
+  roles:
+    - { role: build-images, when: to_build|default(false)|bool }
+  tags:
+    - get-images
+    - images
+
 - name:  copy over config files
   hosts: undercloud
   gather_facts: no