Use new pki_ipaca.ini to spawn instances
    
    Note: Some configuration stanzas are deprecated and have been replaced
    with new stanzas, e.g. pki_cert_chain_path instead of
    pki_external_ca_cert_chain_path.
    
    Fixes: https://pagure.io/freeipa/issue/5608
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>