Use CommandLine cmd (__FILE__) instead of COMMANDLINE macro.

This in effect replaces commit 5e624d550

examples/tcp/tcp-pacing.cc

@@ -52,7 +52,7 @@ main (int argc, char *argv[])
   bool isSack = false;
   uint32_t maxPackets = 0;
 
-  COMMANDLINE (cmd);
+  CommandLine cmd (__FILE__);
   cmd.AddValue ("tracing", "Flag to enable/disable tracing", tracing);
   cmd.AddValue ("maxBytes",
                 "Total number of bytes for application to send", maxBytes);