ipatests: add tests for NTP options usage on server, replica, and client
    
    The following tests are added in test_ntp_options.py :: TestNTPoptions
      - test_server_and_client_install_without_option_n
      - test_server_and_client_install_with_option_n
      - test_server_and_client_install_with_multiple_ntp_server
      - test_server_replica_and_client_install_with_ntp_pool_and_ntp_server
      - test_server_and_client_install_with_mixed_options
      - test_two_step_replica_install_using_ntp_options
      - test_two_step_replica_install_without_ntp_options
    
    Details in the ticket: https://pagure.io/freeipa/issue/7719
    and https://pagure.io/freeipa/issue/7723
    
    Signed-off-by: Varun Mylaraiah <mvarun@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Tibor Dudlak <tdudlak@redhat.com>