cluster: properly handle --inspect-{brk,port}

PR-URL: #11386
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Josh Gavant <josh.gavant@outlook.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/internal/cluster/master.js

@@ -115,7 +115,7 @@ function createWorkerProcess(id, env) {
 
   for (var i = 0; i < execArgv.length; i++) {
     const match = execArgv[i].match(
-      /^(--inspect|--debug|--debug-(brk|port))(=\d+)?$/
+      /^(--inspect|--inspect-(brk|port)|--debug|--debug-(brk|port))(=\d+)?$/
     );
 
     if (match) {

test/parallel/test-cluster-inspector-debug-port.js

@@ -27,6 +27,8 @@ if (cluster.isMaster) {
   fork(4, ['--inspect', '--debug']);
   fork(5, [`--debug=${debuggerPort}`, '--inspect']);
   fork(6, ['--inspect', `--debug-port=${debuggerPort}`]);
+  fork(7, [`--inspect-port=${debuggerPort}`]);
+  fork(8, ['--inspect', `--inspect-port=${debuggerPort}`]);
 } else {
   const hasDebugArg = process.execArgv.some(function(arg) {
     return /inspect/.test(arg);