All the hosts in the domain have IPA master set as their only
nameserver. However, the IPA master does not create records for
these machines by default. This is not an big issue for clients
or replicas, since those records do get created in other ways,
but external hosts using their internal hostnames will not resolve.
Adds an A record for each host in master's domain.
https://fedorahosted.org/freeipa/ticket/4130
Reviewed-By: Petr Viktorin <pviktori@redhat.com>