Merge pull request #6862 from ewolinetz/deprecate_use_callback

Automatic merge from submit-queue.

Updating deprecations to use callback plugin

Instead of just pausing during the run and relying on users to see it, instead format and print the deprecated variables at the end of play instead like this:
```
Initialization             : Complete (0:00:23)
	[DEPRECATION WARNING]: The following are deprecated variables and will be no longer be used in the next minor release. Please update your inventory accordingly. 
	openshift_hosted_logging_deploy 
	openshift_hosted_metrics_deployer_prefix
```

The plugin changes are the same as the changes made in https://github.com/openshift/openshift-ansible/pull/6734

playbooks/deploy_cluster.yml

@@ -6,11 +6,3 @@
 - import_playbook: openshift-node/private/config.yml
 
 - import_playbook: common/private/components.yml
-
-- name: Print deprecated variable warning message if necessary
-  hosts: oo_first_master
-  gather_facts: no
-  tasks:
-  - debug: msg="{{__deprecation_message}}"
-    when:
-    - __deprecation_message | default ('') | length > 0

roles/openshift_sanitize_inventory/tasks/deprecations.yml

@@ -2,15 +2,18 @@
 
 - name: Check for usage of deprecated variables
   set_fact:
-    __deprecation_message: "{{ __deprecation_message | default([]) }} + ['{{ __deprecation_header }} {{ item }} is a deprecated variable and will be no longer be used in the next minor release. Please update your inventory accordingly.']"
+    __deprecation_message: "{{ __deprecation_message | default( __deprecation_header ) }} \n\t{{ item }}"
   when:
   - hostvars[inventory_hostname][item] is defined
   with_items: "{{ __warn_deprecated_vars }}"
 
 - block:
   - debug: msg="{{__deprecation_message}}"
-  - pause:
-      seconds: "{{ 10 }}"
+  - run_once: true
+    set_stats:
+      data:
+        installer_phase_initialize:
+          message: "{{ __deprecation_message }}"
   when:
   - __deprecation_message | default ('') | length > 0
 

roles/openshift_sanitize_inventory/vars/main.yml

@@ -1,6 +1,6 @@
 ---
 
-__deprecation_header: "[DEPRECATION WARNING]:"
+__deprecation_header: "[DEPRECATION WARNING]: The following are deprecated variables and will be no longer be used in the next minor release. Please update your inventory accordingly."
 
 # this is a list of variables that we will be deprecating within the next minor release, this list should be expected to change from release to release
 __warn_deprecated_vars: