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.
{
static const CRPCCommand commands[] =
{ 
  
    { "network",            "getconnectioncount",     &getconnectioncount,     {} },
    { "network",            "ping",                   &ping,                   {} },
    { "network",            "getpeerinfo",            &getpeerinfo,            {} },
    { "network",            "addnode",                &addnode,                {"node","command"} },
    { "network",            "disconnectnode",         &disconnectnode,         {"address", "nodeid"} },
    { "network",            "getaddednodeinfo",       &getaddednodeinfo,       {"node"} },
    { "network",            "getnettotals",           &getnettotals,           {} },
    { "network",            "getnetworkinfo",         &getnetworkinfo,         {} },
    { "network",            "setban",                 &setban,                 {"subnet", "command", "bantime", "absolute"} },
    { "network",            "listbanned",             &listbanned,             {} },
    { "network",            "clearbanned",            &clearbanned,            {} },
    { "network",            "setnetworkactive",       &setnetworkactive,       {"state"} },
    { "network",            "getnodeaddresses",       &getnodeaddresses,       {"count"} },
    { "hidden",             "addpeeraddress",         &addpeeraddress,         {"address", "port"} },
};
    for (const auto& c : commands) {
        t.appendCommand(c.name, &c);
    }
}