Verify pki ini override early
    
    ipa-server-install now verifies the pki ini override file earlier
    
    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>