This adds TLS v1.3 support to the HAProxy role by default, along
with a new variable to manage cipher suites.
The old variable for TLS v1.2 and below ciphers is renamed for
consistency, but is still supported as a default where overridden
by deployments.
Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/823943
Change-Id: Iaf9709ac5f5ac8db281a9ec7278cef274186ba15