Integrate ansible vault

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Refs:

• [x] https://gist.github.com/tristanfisher/e5a306144a637dc739e7
• [x] https://serversforhackers.com/video/ansible-using-vault
• [x] https://therealmarv.com/ansible-vault-file-handling/
• [x] https://www.digitalocean.com/community/tutorials/how-to-use-vault-to-protect-sensitive-ansible-data-on-ubuntu-16-04
• [x] http://docs.ansible.com/ansible/playbooks_vault.html
• [x] https://dantehranian.wordpress.com/2015/07/24/managing-secrets-with-ansible-vault-the-missing-guide-part-1-of-2/
• [x] https://dantehranian.wordpress.com/2015/08/17/encrypting-login-credentials-in-ansible-vault/
• [x] https://roots.io/trellis/docs/vault/
• [x] https://codereviewvideos.com/course/ansible-tutorial/video/ansible-vault-tutorial