Use ansible_fqdn instead of ansible_hostname.
Use ansible_fqdn instead of ansible_hostname.

Based on jkilpatr browbeat patch using ansible_fqdn in
lieu of ansible_hostname is an improvement, for hosts
that properly setup an FQDN this will provide better verbose
debug instructions for client setup.  For hosts without a
proper FQDN it should revert to using host shortname anyway.

Referencing browbeat patch:
https://review.openstack.org/#/c/346969/

sadsfae/ansible-elk,sadsfae/ansible-elk-2.4