Remove workaround for CA running check
    
    A workaround was introduced for ticket #4676 that used wget to
    perform an (unauthenticated) https request to check the CA status.
    Later, wget was changed to curl (the request remained
    unauthenticated).
    
    Remove the workaround and use an http request (no TLS) to check the
    CA status.  Also remove the now-unused unauthenticated_http_request
    method, and update specfile to remove ipalib dependency on curl.
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>