Allow passing custom openshift-ansible playbook

This allows deploying openshift from the packaged openshift-ansible or
from a git checkout more easily, by setting the
OpenShiftAnsiblePlaybook heat environment variable.

Change-Id: I60594faa10dfd817d94038b3938d7de269330e2e

extraconfig/services/openshift-master.yaml

@@ -37,6 +37,10 @@ parameters:
     default: {}
     description: Global Ansible variables for OpenShift-Ansible installer.
     type: json
+  OpenShiftAnsiblePlaybook:
+    default: '/usr/share/ansible/openshift-ansible/playbooks/byo/config.yml'
+    description: Path to OpenShift-Ansible playbook.
+    type: string
 
 outputs:
   role_data:
@@ -117,6 +121,10 @@ outputs:
                 dest: "{{playbook_dir}}/openshift/global_vars.yml"
                 content: "{{openshift_global_vars|to_nice_yaml}}"
 
+            - name: set openshift ansible playbook path
+              set_fact:
+                openshift_ansible_playbook_path: {get_param: OpenShiftAnsiblePlaybook}
+
             - name: generate openshift playbook
               copy:
                 dest: "{{playbook_dir}}/openshift/playbook.yml"
@@ -163,7 +171,7 @@ outputs:
                           state: restarted
                           enabled: yes
 
-                  - include: /usr/share/ansible/openshift-ansible/playbooks/byo/config.yml
+                  - include: "{{openshift_ansible_playbook_path}}"
             - name: set openshift command
               set_fact:
                 openshift_command: >-