For every peer expose through `getpeerinfo` RPC whether or not we selected them as HB peers, and whether or not they selected us as HB peers.

Suggestion by @gmaxwell.
}
        if (pfrom.m_tx_relay != nullptr) {
            LOCK(pfrom.m_tx_relay->cs_tx_inventory);
            pfrom.m_tx_relay->fSendMempool = true;
        }
        return;
    }
    if (msg_type == NetMsgType::PING) {
        if (pfrom.GetCommonVersion() > BIP0031_VERSION) {
            uint64_t nonce = 0;
            vRecv >> nonce;
            
            
            
            
            
            
            
            
            
            
            
            m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::PONG, nonce));
        }
        return;
    }
    if (msg_type == NetMsgType::PONG) {
        const auto ping_end = time_received;
        uint64_t nonce = 0;
        size_t nAvail = vRecv.in_avail();