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).

tasks.create_tmpfiles_dirs only needs IPAAPI_USER as an argument for
version 4.5.4. For 4.5 there is no support for arguments.

IPAAPI_USER is therefore only needed for 4.5.4 in
module_utils/ansible_ipa_server.py

This methods creates a list of ipautil.CheckedIPAddress from the provided
ip string list.

The support for external cert files is not complete yet.