Now users can add reverse zones in classless form:
0/25.1.168.192.in-addr.arpa.
0-25.1.168.192.in-addr.arpa.
128/25 NS ns.example.com.
10 CNAME 10.128/25.1.168.192.in-addr.arpa.
Ticket: https://fedorahosted.org/freeipa/ticket/4143
Reviewed-By: Jan Cholasta <jcholast@redhat.com>