Enable tripleo_free strategy for upgrade

The tripleo_free startegy cuts the run time of composable upgrade.
But as each node gets to different point of code there is need to
remove clear_facts part from tripleo-packages. The clear_facts
applies globaly meaning if messaging node looks for distribution
fact while controller runs clear_facts we will fail. The
clear_facts was added to force ansible to reset the
ansible_python_interpreter. This should be avoided by simply
setting default python by alternatives command and it's irelevant
to any other version than stable/train.

Change-Id: I556327228f23eb5e744b580618fb581a9fd2ce41
(cherry picked from commit 735faf0478)

common/deploy-steps.j2

@@ -934,6 +934,7 @@ outputs:
                 deploy_target_host: "DEPLOY_TARGET_HOST"
 {%- for step in range(0,upgrade_steps_max) %}
             - hosts: DEPLOY_TARGET_HOST
+              strategy: tripleo_free
               name: Upgrade tasks for step {{step}}
               become: true
               gather_facts: "{% raw %}{{ gather_facts | default(false) }}{% endraw %}"
@@ -973,6 +974,7 @@ outputs:
                 deploy_source_host: "DEPLOY_SOURCE_HOST"
                 deploy_target_host: "DEPLOY_TARGET_HOST"
             - hosts: DEPLOY_TARGET_HOST
+              strategy: tripleo_free
               any_errors_fatal: yes
               tasks:
                 - include_tasks: post_upgrade_steps_tasks.yaml
@@ -1001,6 +1003,7 @@ outputs:
                 deploy_target_host: "DEPLOY_TARGET_HOST"
 {%- for step in range(external_upgrade_steps_max) %}
             - hosts: DEPLOY_SOURCE_HOST
+              strategy: tripleo_free
               name: External upgrade step {{step}}
               gather_facts: "{% raw %}{{ gather_facts | default(false) }}{% endraw %}"
               any_errors_fatal: yes

deployment/tripleo-packages/tripleo-packages-baremetal-puppet.yaml

@@ -312,11 +312,9 @@ outputs:
             - name: reboot to perform the upgrade
               reboot:
                 reboot_timeout: "{{upgrade_leapp_reboot_timeout}}"
-            - name: Clear gathered facts from all currently targeted hosts
-              meta: clear_facts
-            - name: Force facts refresh after OS upgrade to refresh cache.
-              setup:
             - name: Set the python to python3
+              vars:
+                ansible_python_interpreter: "/usr/bin/python3"
               shell: alternatives --set python /usr/bin/python3
 
         - name: Package and repo update tasks