Adapt ContainerImagePrepareDebug to the string pattern

Like other *Debug parameters, make it so we first look for
ContainerImagePrepareDebug to be set, otherwise we fallback to Debug;
like we already do in all other OpenStack services.

Change-Id: I0f18b475c69a8ba71b06f517e87caf0d5c209fbb

deployment/container-image-prepare/container-image-prepare-baremetal-ansible.j2.yaml

@@ -60,7 +60,9 @@ parameters:
   ContainerImagePrepareDebug:
     default: false
     description: Whether or not we want to activate --debug in tripleo container image prepare.
-    type: boolean
+    type: string
+    constraints:
+      - allowed_values: [ '', 'true', 'True', 'TRUE', 'false', 'False', 'FALSE']
   ContainerImageRegistryCredentials:
     type: json
     hidden: true
@@ -91,6 +93,10 @@ parameters:
     default: {{role.CountDefault|default(0)}}
 {% endfor %}
 
+conditions:
+
+  service_debug_unset: {equals : [{get_param: ContainerImagePrepareDebug}, '']}
+
 outputs:
   role_data:
     description: Role data for container image prepare
@@ -102,7 +108,11 @@ outputs:
             name: tripleo-container-image-prepare
           vars:
             tripleo_container_image_prepare_log_file: {get_param: ContainerImagePrepareLogFile}
-            tripleo_container_image_prepare_debug: {get_param: ContainerImagePrepareDebug}
+            tripleo_container_image_prepare_debug:
+              if:
+              - service_debug_unset
+              - {get_param: Debug }
+              - {get_param: ContainerImagePrepareDebug }
             tripleo_container_image_prepare_roles: {{ roles }}
             tripleo_container_image_prepare_content:
               parameter_defaults: