Include {{step}} when setting facts

We don't set the fact specific to a step and it seems
to run those puppet tasks for subsequent steps too.

Change-Id: Ic276ea6f34dd638ad66505aa77bddff0e4071ad4
Closes-Bug #1870291
(cherry picked from commit 6db0ac0856)

common/deploy-steps-tasks.yaml

@@ -224,8 +224,8 @@
 
 - name: Calculate container_puppet_tasks for {{ansible_hostname | lower}} step {{step}}
   set_fact:
-    host_container_puppet_tasks: "{{host_container_puppet_tasks|default([]) + [item]}}"
-  loop: "{{container_puppet_tasks.get('step_' + step, [])}}"
+    "{{'host_container_puppet_tasks_' ~ step}}": "{{lookup('vars', 'host_container_puppet_tasks_' ~ step, default=[]) | union([item])}}"
+  loop: "{{container_puppet_tasks.get('step_' ~ step, [])}}"
   when: (groups[item.service_name] | default ([]) | map('extract', hostvars, 'inventory_hostname') | sort | first | lower) == ansible_hostname | lower
   vars:
     container_puppet_tasks: "{{ lookup('file', tripleo_role_name + '/container_puppet_tasks.yaml', errors='ignore') | default({}, True) | from_yaml }}"
@@ -234,6 +234,6 @@
 
 - name: Include container-puppet tasks for step {{step}}
   include_tasks: host-container-puppet-tasks.yaml
-  when: host_container_puppet_tasks is defined
+  when: ('host_container_puppet_tasks_' ~ step)  is defined
   tags:
     - container_config_tasks

common/host-container-puppet-tasks.yaml

@@ -1,7 +1,7 @@
 - name: Write container-puppet-tasks json file for {{ansible_hostname | lower}} step {{step}}
   no_log: True
   copy:
-    content: "{{host_container_puppet_tasks|to_nice_json}}"
+    content: "{{lookup ('vars', 'host_container_puppet_tasks_' ~ step, default=[]) | to_nice_json}}"
     dest: "/var/lib/container-puppet/container-puppet-tasks{{step}}.json"
     force: yes
     mode: '0600'