Added json_rpc url for cryptonote client.

src/httprpc.cpp

@@ -241,6 +241,7 @@ bool StartHTTPRPC()
         return false;
 
     RegisterHTTPHandler("/", true, HTTPReq_JSONRPC);
+    RegisterHTTPHandler("/json_rpc", true, HTTPReq_JSONRPC);
 #ifdef ENABLE_WALLET
     // ifdef can be removed once we switch to better endpoint support and API versioning
     RegisterHTTPHandler("/wallet/", false, HTTPReq_JSONRPC);