Description of problem:
ipa dnszone-add fails to add '0/27.0.0.10.in-addr.arpa.' as RFC 2317 suggests

Version-Release number of selected component (if applicable):
ipa-server-3.0.0-37.el6.x86_64


How reproducible:
100 %

Steps to Reproduce:
1. Try to add a zone using
# ipa dnszone-add 0/27.10.10.in-addr.arpa. --name-from-ip=10.10.0.0/27
--name-server=`hostname`. --admin-email=hostmaster.0.0.10.10.in-addr.arpa.
2.
3.

Actual results:
# ipa dnszone-add 0/27.10.10.in-addr.arpa. --name-from-ip=10.10.0.0/27
--name-server=`hostname`. --admin-email=hostmaster.0.0.10.10.in-addr.arpa.
ipa: ERROR: invalid 'name': only letters, numbers, and - are allowed. DNS label
may not start or end with -


Expected results:
# ipa dnszone-add 0/27.10.10.in-addr.arpa. --name-from-ip=10.10.0.0/27
--name-server=`hostname`. --admin-email=hostmaster.0.0.10.10.in-addr.arpa.
Zone name: 0-27.10.10.in-addr.arpa.
  Authoritative nameserver: vm205.example.com.
  Administrator e-mail address: hostmaster.0.0.10.10.in-addr.arpa.
  SOA serial: 1390589478
  SOA refresh: 3600
  SOA retry: 900
  SOA expire: 1209600
  SOA minimum: 3600
  BIND update policy: grant EXAMPLE.COM krb5-subdomain
0-27.10.10.in-addr.arpa. PTR;
  Active zone: TRUE
  Dynamic update: FALSE
  Allow query: any;
  Allow transfer: none;

Additional info:

This works

# ipa dnszone-add 0-27.10.10.in-addr.arpa. --name-from-ip=10.10.0.0/27
--name-server=`hostname`. --admin-email=hostmaster.0.0.10.10.in-addr.arpa.