Add peerid to getpeerinfo to allow correlation with the logs.

This seems to have been missed in 3764.

src/rpcnet.cpp

@@ -79,6 +79,7 @@ Value getpeerinfo(const Array& params, bool fHelp)
             "\nbResult:\n"
             "[\n"
             "  {\n"
+            "    \"id\": n,                   (numeric) Peer index\n"
             "    \"addr\":\"host:port\",      (string) The ip address and port of the peer\n"
             "    \"addrlocal\":\"ip:port\",   (string) local address\n"
             "    \"services\":\"xxxxxxxxxxxxxxxx\",   (string) The services offered\n"
@@ -113,6 +114,7 @@ Value getpeerinfo(const Array& params, bool fHelp)
         Object obj;
         CNodeStateStats statestats;
         bool fStateStats = GetNodeStateStats(stats.nodeid, statestats);
+        obj.push_back(Pair("id", stats.nodeid));
         obj.push_back(Pair("addr", stats.addrName));
         if (!(stats.addrLocal.empty()))
             obj.push_back(Pair("addrlocal", stats.addrLocal));