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

PR-URL: https://github.com/nodejs/node/pull/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>