The configuration of DNS failed because of missing DNS settings in the
ipareplica_prepare and ipareplica_setup_dns.

Some fixed settings for use with DNSInstallInterface have been added
to ansible_ipa_replica:

options.dnssec_master = False
options.disable_dnssec_master = False
options.kasp_db_file = None
options.force = False

Fixes: #58 (install-replica fails: reverse_zones seems to be empty)
Fixes: #63 (ipareplica_setup_dns fails)