tasks: galera_post_install: Configure the service before securing the DB
tasks: galera_post_install: Configure the service before securing the DB

The DB secure tool attempts to start the DB but this may fail if the
systemd service is not configured properly. As such, we move the service
configuration tasks before those that secure the db.

Change-Id: I49f5cee0494b89d5018056fbed84f52a67aa7399

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