Bug 1006355,1006908,1006701 - Multiple related NodeJS bugs

https://bugzilla.redhat.com/show_bug.cgi?id=1006355
https://bugzilla.redhat.com/show_bug.cgi?id=1006908
https://bugzilla.redhat.com/show_bug.cgi?id=1006701

- Fixed `ps`/`pgrep` parsing issues when running `node` commands without
SCL
- Fixed PID comparison when stopping cartridge