- Add both anycast addresses to a.recursive-servers.dn42
- Create [a0|a3].recursive-servers.dn42, one for each anycast address
- the naming is chosen to allow for future use of a1 and a2,
corresponding to 172.21.0.53 and 172.22.0.53
- Add SRV records to allow for automated discovery of the recursive
server providers
- Remove Yamakaja's y.recursive-servers.dn42