Allow galera_address to be FQDN
Allow galera_address to be FQDN

We explicitly allow setting galera_address as FQDN and define it equal
to internal_lb_vip_address by default [1]

Currently if it's set to FQDN certificate generation fails, as we
provide it always as IP.

[1] https://opendev.org/openstack/openstack-ansible/src/branch/master/inventory/group_vars/all/infra.yml#L35

Change-Id: I7b470df7ff45c884c8058f75a7f6a73a41f34911

openstack/openstack-ansible-galera_server,openstack/openstack-ansible-galera_server