Lowered version check to be compatible with CentOS 7.5
Added missing attributes to setup_kra to be compatible with latest python2-ipaserver librarty on CentOS 7.5 (python2-ipaserver-4.5.4-10.el7.centos.3.noarch)
With IPA 4.7 bigger changes have been introduced
Changes:
- Use of timeconf and chrony instead of ntpconf and ntpd.
- New IPAChangeConf (not used in ipaserver modules)
- New check_ldap_conf form ipaclient.install.client
- custodia instance needed for ca and kra
- no_ntp defaults to yes for client installation part
- A new option ntp_pool has been introduced (set to None).
