[JENKINS-20289] - Add support of child processes retrieval #15
Description
Jenkins background:
The current Jenkins version uses "winp" to recursively terminate Windows processes. Such approach works well, but ProcessKiller extensions cannot be invoked for the entire process tree on Windows, so their behavior differs from Linux.
I propose to replace getChildren() and getParent() method stubs by working implementations using additional methods in the native part.
My use-case:
- Terminate Cygwin processes using https://wiki.jenkins-ci.org/display/JENKINS/Cygwin+Process+Killer+Plugin