[update] Ensure we get fresh hiera data before running update_steps.

We need to make sure that the hiera data are fresh before the update
step so that anyone using those data during those steps are seeing the
latest information from heat.

Factor out the hiera generation and include it in deployment and
update playbooks.

The double tasks definition in the deployment playbook seemed to be
redundant so It has been removed.

Change-Id: I6b6c676880ccc8cbed23af135e5865c222a8f1d0
Closes-Bug: #1861799
With some adjustment:
(cherry picked from commit 536230b323)

common/deploy-steps.j2

@@ -390,6 +390,7 @@ outputs:
         extra_hosts_entries: {get_param: ExtraHostsEntries}
         vip_hosts_entries: {get_param: VipHostsEntries}
       common_deploy_steps_tasks: {get_file: deploy-steps-tasks.yaml}
+      hiera_steps_tasks: {get_file: hiera-steps-tasks.yaml}
       deploy_steps_tasks_step_0: {get_file: deploy-steps-tasks-step-0.yaml}
       common_deploy_steps_tasks_step_1: {get_file: deploy-steps-tasks-step-1.yaml}
       container_startup_configs_tasks: {get_file: container_startup_configs_tasks.yaml}
@@ -525,44 +526,7 @@ outputs:
               gather_facts: {{ '"{{' }} gather_facts | default(false) {{ '}}"' }}
               any_errors_fatal: yes
               tasks:
-                - name: Hiera configuration
-                  when: not ansible_check_mode|bool
-                  block:
-                    - name: Hiera config
-                      include_role:
-                        name: tripleo-hieradata
-                    - name: Hiera symlink
-                      file:
-                        src: /etc/puppet/hiera.yaml
-                        dest: /etc/hiera.yaml
-                        state: link
-                        force: true
-              tags:
-                - overcloud
-                - pre_deploy_steps
-
-            - hosts: {{primary_role_name}}:DEPLOY_TARGET_HOST
-              name: Server hieradata from vars
-              gather_facts: {{ '"{{' }} gather_facts | default(false) {{ '}}"' }}
-              any_errors_fatal: yes
-              tasks:
-                - name: Hieradata from vars
-                  when: not ansible_check_mode|bool
-                  include_role:
-                    name: tripleo-hieradata
-                    tasks_from: hieradata_vars.yaml
-                  vars:
-                    hieradata_templates_list:
-                      - bootstrap_node
-                      - all_nodes
-                      - vip_data
-                      - net_ip_map
-                      - cloud_domain
-                      - fqdn
-                      - service_names
-                      - service_configs
-                      - extraconfig
-                      - role_extraconfig
+                - import_tasks: hiera_steps_tasks.yaml
               tags:
                 - overcloud
                 - pre_deploy_steps
@@ -1007,6 +971,7 @@ outputs:
                 docker_puppet_mount_host_puppet: DOCKER_PUPPET_MOUNT_HOST_PUPPET
                 tripleo_minor_update: true
               tasks:
+                - import_tasks: hiera_steps_tasks.yaml
                 - include_tasks: update_steps_tasks.yaml
                   with_sequence: start=0 end={{update_steps_max-1}}
                   loop_control:

common/hiera-steps-tasks.yaml

@@ -0,0 +1,30 @@
+- name: Hiera configuration
+  when: not ansible_check_mode|bool
+  block:
+    - name: Hiera config
+      include_role:
+        name: tripleo-hieradata
+    - name: Hiera symlink
+      file:
+        src: /etc/puppet/hiera.yaml
+        dest: /etc/hiera.yaml
+        state: link
+        force: true
+
+- name: Hieradata from vars
+  when: not ansible_check_mode|bool
+  include_role:
+    name: tripleo-hieradata
+    tasks_from: hieradata_vars.yaml
+  vars:
+    hieradata_templates_list:
+      - bootstrap_node
+      - all_nodes
+      - vip_data
+      - net_ip_map
+      - cloud_domain
+      - fqdn
+      - service_names
+      - service_configs
+      - extraconfig
+      - role_extraconfig