Update Ansible's configuration.

command_warning is being deprected, callback_whitelist is being renamed to
callback_enabled.

ansible.cfg

 [defaults]
-callback_whitelist = ansible.posix.profile_tasks, ansible.posix.timer
-command_warnings = True
+callback_enabled = ansible.posix.profile_tasks, ansible.posix.timer
 deprecation_warnings = True
 fact_caching = jsonfile
 fact_caching_connection = ~/.ansible/facts