Use include_tasks instead of import_tasks

include_tasks is dynamic and the tasks are either included (or not) at
runtime. This has the advantage that if a "when" keyword excludes the
include_tasks, then all the tasks are excluded as a group.

This is opposed to import_tasks which happen at playbook parse time. The
"when" keyword is inherited by each individual task that was imported.

While the two are functionally equivalent for these use cases,
import_tasks ends up being much slower, since ansible then has to
compute a much larger set of tasks to skip at runtime. Using
include_tasks is much faster, even at small scale (~50 hosts).

Change-Id: I2db81d39b3294aa2784a340562f10fd9bf3fe9ee

common/deploy-steps-tasks-step-0.j2.yaml

@@ -13,6 +13,6 @@
   copy: src=container_puppet_script.yaml dest=/var/lib/container-puppet/container-puppet.sh force=yes mode=0755 setype=container_file_t
 
 {%- for role in roles %}
-- import_tasks: {{role.name}}/deploy_steps_tasks.yaml
+- include_tasks: {{role.name}}/deploy_steps_tasks.yaml
   when: tripleo_role_name == '{{role.name}}'
 {%- endfor %}

common/deploy-steps.j2

@@ -513,7 +513,7 @@ outputs:
                 docker_puppet_process_count: DOCKER_PUPPET_PROCESS_COUNT
                 docker_puppet_mount_host_puppet: DOCKER_PUPPET_MOUNT_HOST_PUPPET
               tasks:
-                - import_tasks: deploy_steps_tasks_step_0.yaml
+                - include_tasks: deploy_steps_tasks_step_0.yaml
               tags:
                 - overcloud
                 - deploy_steps
@@ -772,7 +772,7 @@ outputs:
                   debug:
                     msg: Use --start-at-task 'Deploy step tasks for {{step}}' to resume from this task
 {%- for role in roles %}
-                - import_tasks: {{role.name}}/deploy_steps_tasks.yaml
+                - include_tasks: {{role.name}}/deploy_steps_tasks.yaml
                   when: tripleo_role_name == '{{role.name}}'
 {%- endfor %}
               tags:
@@ -835,7 +835,7 @@ outputs:
                   stat:
                     path: /var/lib/tripleo-config/container-startup-config-1.json
                   register: container_startup_configs_json_stat
-                - import_tasks: common_deploy_steps_tasks.yaml
+                - include_tasks: common_deploy_steps_tasks.yaml
                   when: (deploy_identifier is defined and deploy_identifier != "" and deploy_identifier is not none) or
                         (container_startup_configs_json_stat is defined and not container_startup_configs_json_stat.stat.exists)
               tags: