Description of problem:
The IPA installer does not support classless reverse zones.
Specifying a classless reverse zone like
--reverse-zone=128/25.136.19.172.in-addr.arpa. results in an empty zone
post-install.


Version-Release number of selected component (if applicable):
ipa-server-4.4.0-12.el7

How reproducible:
Always

Steps to Reproduce:
1. launch ipa-server-install --reverse-zone=128/25.136.19.172.in-addr.arpa.
2. if it succeeds the reverse zone is empty

Actual results:
Empty reverse zone

Expected results:
Non-empty reverse zone