rpc: Add `relaytxes` flag to `getnetworkinfo`

Re-work of PR #7841 by dragongem45.
Closes #7771.

src/rpc/net.cpp

@@ -460,6 +460,7 @@ UniValue getnetworkinfo(const UniValue& params, bool fHelp)
             "  \"subversion\": \"/Satoshi:x.x.x/\",     (string) the server subversion string\n"
             "  \"protocolversion\": xxxxx,              (numeric) the protocol version\n"
             "  \"localservices\": \"xxxxxxxxxxxxxxxx\", (string) the services we offer to the network\n"
+            "  \"localrelay\": true|false,              (bool) true if transaction relay is requested from peers\n"
             "  \"timeoffset\": xxxxx,                   (numeric) the time offset\n"
             "  \"connections\": xxxxx,                  (numeric) the number of connections\n"
             "  \"networks\": [                          (array) information per network\n"
@@ -494,6 +495,7 @@ UniValue getnetworkinfo(const UniValue& params, bool fHelp)
     obj.push_back(Pair("subversion",    strSubVersion));
     obj.push_back(Pair("protocolversion",PROTOCOL_VERSION));
     obj.push_back(Pair("localservices",       strprintf("%016x", nLocalServices)));
+    obj.push_back(Pair("localrelay",     fRelayTxes));
     obj.push_back(Pair("timeoffset",    GetTimeOffset()));
     obj.push_back(Pair("connections",   (int)vNodes.size()));
     obj.push_back(Pair("networks",      GetNetworksInfo()));