ipv6 addresses in dhcpd.conf

This issue occurs in HA installations, when there are ipv6 and ipv4 addresses configured in the same interface and the same VLAN where DHCP is enabled. Sometimes ipv6 addresses are used in the address and peer address parameters on the failover DHCP configuration on dhcpd.conf.

It seems that MAAS does not check the type of the ip addresses when building the failover configuration in the make_failover_peer_config method on dhcpd.conf.

I'm using snap version 3.2.8-12050-g.fc2c8d020.

Example:

- Secondary DHCP node:

#
# Failover Peers
#
failover peer "failover-vlan-5001" {
  secondary;
  address 192.168.133.6;
  peer address 2001:1890:f804:5f05:e643:4bff:fea6:8aa7;
  max-response-delay 60;
  max-unacked-updates 10;
  load balance max seconds 3;
}

- Primary DHCP node:

#
# Failover Peers
#
failover peer "failover-vlan-5001" {
  primary;
  address 2001:1890:f804:5f05:e643:4bff:fea6:8aa7;
  peer address 192.168.133.6;
  max-response-delay 60;
  max-unacked-updates 10;
  load balance max seconds 3;
  mclt 3600;
  split 255;
}