Run image prepare after registry install

For containerized undercloud install this completes the image
preperation. The flow for undercloud install is now:

1. Early in tripleo deploy there is a dry-run prepare which generates
the heat environment for all of the image parameters
2. Here after the registry is installed, populate it by running
prepare again

This file is now a jinja template so that the prepare command has
access to the roles data. This reduces the number of images processed
to services which *might* be containerized, but we can't filter by
services which *are* containerised because we're inside the heat stack
and don't have access to the full heat environment. The actual image
numbers are:
136 prepare with no filtering
97 prepare filtering only by roles_data_undercloud.yaml
64 prepare with undercloud env+roles_data_undercloud.yaml filtering

This might be a time hit for undercloud jobs, but hopefully not
a big hit for undercloud+overcloud jobs because many of those extra images
will be used in the overcloud.

Change-Id: I7449ee364ec9e976fbe9df95024ce3c42f6459b5
Blueprint: container-prepare-workflow

puppet/services/docker-registry.j2.yaml

@@ -34,6 +34,12 @@ parameters:
     default: ''
     description: The IP address used to bind the local container registry
     type: string
+  ContainerImagePrepare:
+    default: {}
+    description: Used to run "openstack tripleo container image prepare".
+                 This is run after the registry is installed to populate
+                 the registry with images.
+    type: json
 
 conditions:
   local_container_registry_is_empty: {equals : [{get_param: LocalContainerRegistry}, '']}
@@ -65,6 +71,36 @@ outputs:
           - include_role:
               name: container-registry
               tasks_from: docker-distribution
+          - name: Create temp file for prepare parameter
+            tempfile:
+              state: file
+              suffix: -prepare-param
+            register: prepare_param
+          - name: Create temp file for role data
+            tempfile:
+              state: file
+              suffix: -role-data
+            register: role_data
+          - name: Write ContainerImagePrepare parameter file
+            copy:
+              dest: "{{ '{{' }} prepare_param.path {{ '}}' }}"
+              content:
+                parameter_defaults:
+                  ContainerImagePrepare: {get_param: ContainerImagePrepare}
+          - name: Write role data file
+            copy:
+              dest: "{{ '{{' }} role_data.path {{ '}}' }}"
+              content: {{ roles }}
+          - name: Run openstack tripleo container image prepare
+            command: openstack tripleo container image prepare --roles-file {{ '{{' }} role_data.path {{ '}}' }} --environment-file {{ '{{' }} prepare_param.path {{ '}}' }}
+          - name: Delete param file
+            file:
+              dest: "{{ '{{' }} prepare_param.path {{ '}}' }}"
+              state: absent
+          - name: Delete role file
+            file:
+              dest: "{{ '{{' }} role_data.path {{ '}}' }}"
+              state: absent
       upgrade_tasks:
         - name: Install docker packages on upgrade if missing
           when: step|int == 3