When a new DNS zone is being created a local hostname is set as a
nameserver of the new zone. However, when the zone is created
during ipa-replica-prepare, the the current master/replica doesn't
have to be an IPA server with DNS support. This would lead to DNS
zones with incorrect NS records as they wouldn't point to a valid
name server.
Now, a list of all master servers with DNS support is retrieved
during DNS zone creation and added as NS records for a new DNS
zone.
https://fedorahosted.org/freeipa/ticket/1261