Title: #117: Make ipa-replica-install run in interactive mode
Running the command in interactive mode by default is desirable behaviour.
Since the `-U` flag was present in previous versions, we don't have to worry
about backward compatibility.
See the full comment at
Manage your subscription for the Freeipa-devel mailing list:
Contribute to FreeIPA: http://www.freeipa.org/page/Contribute/Code