lib: remove the invalid command line options

The option --remote_debugging_server and --debug-agent are
not supported now.

PR-URL: https://github.com/nodejs/node/pull/13764
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/internal/bootstrap_node.js

@@ -136,14 +136,6 @@
         NativeModule.require('node-inspect/lib/_inspect').start();
       });
 
-    } else if (process.argv[1] === '--remote_debugging_server') {
-      // Start the debugging server
-      NativeModule.require('internal/inspector/remote_debugging_server');
-
-    } else if (process.argv[1] === '--debug-agent') {
-      // Start the debugger agent
-      NativeModule.require('_debug_agent').start();
-
     } else if (process.profProcess) {
       NativeModule.require('internal/v8_prof_processor');