-includeconf=<path> support in config handler, for including external configuration files

src/bitcoin-cli.cpp

@@ -107,7 +107,7 @@ static int AppInitRPC(int argc, char* argv[])
         return EXIT_FAILURE;
     }
     try {
-        gArgs.ReadConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME));
+        gArgs.ReadConfigFiles();
     } catch (const std::exception& e) {
         fprintf(stderr,"Error reading configuration file: %s\n", e.what());
         return EXIT_FAILURE;