corosync unicast mode not selecting ipv6 addresses for nodes

[Edward Hope-Morley]

nodelist {

        node {
               ring0_addr: 10.5.21.23
               nodeid: 1000
        }

        node {
               ring0_addr: 10.5.21.22
               nodeid: 1001
        }

}

[Edward Hope-Morley (hopem)]

There appears to be no check or selection happening if prefer-ipv6=True and corosync_transport=unicast when building the node list for corosync.conf. If this was running in a pure ipv6 environment (and there were no ipv4 addresses) it might not be an issue but we do support dual stack so will need to fix this.