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What does this PR do?
Replaces the old method of determining child pids with something more reliable and accurate.
What issues does this PR fix or reference?
https://github.com/saltstack/zh/issues/742
Previous Behavior
Child pids were not killed because we had to wait on the return of the forked proc in order to even get the child pid. Now we just look at the children of the pid using psutil.
Tests written?
No