Makes refresh request to all peers for given address family.

        Skips making request to peer that have valid RTC capability.

def req_rr_to_non_rtc_peers(self, route_family):
        """Makes refresh request to all peers for given address family.

        Skips making request to peer that have valid RTC capability.
        """
        assert route_family != RF_RTC_UC
        for peer in self._peers.values():
            # First check if peer is in established state
            if (peer.in_established and
                # Check if peer has valid capability for given address
                # family
                    peer.is_mbgp_cap_valid(route_family) and
                # Check if peer has valid capability for RTC
                    not peer.is_mbgp_cap_valid(RF_RTC_UC)):
                peer.request_route_refresh(route_family)