Chen 4df02d66be Update deprecated 'play_hosts' with 'ansible_play_batch'
Ansible built-in variable 'play_hosts' has been deprecated since
release 2.2, and replaced by a new 'ansible_play_batch' variable
according to the official document below. We should reflect the
update to playbook site.yml.
link: http://docs.ansible.com/ansible/playbooks_variables.html

Change-Id: I937fe93ea893a3469019a0759ec57d2e91e8adab
Closes-Bug: #1694650
2017-05-31 19:19:11 +09:00
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