ipareplica: Add support for 4.7 (4.6.90-pre2)

With IPA 4.7 bigger changes have been introduced

Changes:
- Use of timeconf and chrony instead of ntpconf and ntpd.
- custodia instance needed for ca and kra
- Use of create_ipa_conf with changed setting in setup_http for install_http,
  reverted back afterwards.