cluster: sometimes debug-port value for child process can be broken - #1524

cluster: sometimes debug-port value for child process can be broken#1524

Olegas wants to merge 6 commits into

nodejs:v1.xnodejs/node:v1.xfrom

Olegas:fix-broken-debug-portOlegas/io.js:fix-broken-debug-portCopy head branch name to clipboard