Support interactive prompt for ntp options
As the FreeIPA server is no longer a NTP service
providing instance its clients and replicas
configuration of time service can not be handled
as it was before change to chrony. Configuration
using master FQDN or autodiscovery for DNS record
would make no difference because every FreeIPA
instance is only chrony client now and does not
update DNS _ntp._udp record.
FreeIPA now asks user for NTP source server
or pool address in interactive mode if there is
no server nor pool specified and autodiscovery
has not found any NTP source in DNS records.
Resolves: https://pagure.io/freeipa/issue/7747
Reviewed-By: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>