Allow galera to listen on v4/v6
Allow galera to listen on v4/v6

While working on https://review.openstack.org/#/c/320542/, galera
was found to be listening only on IPv6 addresses. Connections to
::1 worked fine, but connections to 127.0.0.1 failed.

This patch ensures that galera is listening on all IPv4 and IPv6
addresses.

Closes-bug: 1620793
Change-Id: I1ddae03343b6fe9542b6118810cc55108d4417c0

openstack/openstack-ansible-galera_server,openstack/openstack-ansible-galera_server,os-cloud/openstack-ansible-galera_server,os-cloud/openstack-ansible-galera_server