Use tripleo linear when not using tripleo free

In order to handle percentage failures for tripleo classes we will need
to use a custom strategy to handle the failures. Let's explicitly define
our expected strategies in the playbook so it'll default to linear (the
ansible default) on the host when ansible is invoked but our deployment
tasks will be run as we want them.

Depends-On: https://review.opendev.org/#/c/724766/
Change-Id: Ifaddeccfbb82e03815311ee0b76eb2e2eae282a7
(cherry picked from commit 029722ef1f)

common/deploy-steps-playbooks-common.yaml

@@ -33,6 +33,7 @@
     - always
 
 - hosts: "{{ deploy_target_host }}"
+  strategy: tripleo_linear
   name: Ensure /var/lib/config-data context
   become: true
   gather_facts: false

common/deploy-steps.j2

@@ -444,6 +444,7 @@ outputs:
                 deploy_target_host: "DEPLOY_TARGET_HOST"
 
             - hosts: DEPLOY_TARGET_HOST
+              strategy: tripleo_linear
               name: Manage SELinux
               gather_facts: "{% raw %}{{ gather_facts | default(false) }}{% endraw %}"
               any_errors_fatal: yes
@@ -455,6 +456,7 @@ outputs:
                     state: SELINUX_MODE
 
             - hosts: all
+              strategy: tripleo_linear
               name: Generate /etc/hosts
               gather_facts: "{% raw %}{{ gather_facts | default(false) }}{% endraw %}"
               any_errors_fatal: yes
@@ -470,6 +472,7 @@ outputs:
 {% endraw %}
 
             - hosts: DEPLOY_TARGET_HOST
+              strategy: tripleo_linear
               name: Common roles for TripleO servers
               gather_facts: "{% raw %}{{ gather_facts | default(false) }}{% endraw %}"
               any_errors_fatal: yes
@@ -822,6 +825,7 @@ outputs:
 {% endraw %}
 
             - hosts: DEPLOY_SOURCE_HOST
+              strategy: tripleo_linear
               name: External deployment Post Deploy tasks
               gather_facts: "{% raw %}{{ gather_facts | default(false) }}{% endraw %}"
               any_errors_fatal: yes