haproxy ansilbe role with certbot support

NOTE: to install certbot for SSL termination in haproxy set the variable
	'install_certbot' to true in your inventory file.
	eg)
---
containers:
	hosts:
		haproxy:
			internal_ip: 10.0.0.1
			ansible_port: 25001
			domain_name: example.com
			install_certbot: true

NOTE: this expects your certificates at '/etc/letsencrypt/live/__domain__/'