fix zombie process failing on travis due to ENOSYS
fix zombie process failing on travis due to ENOSYS

mrjefftang/psutil,qbit/psutil,Q-Leap-Networks/psutil,packages/psutil,mrjefftang/psutil,jorik041/psutil,cloudbase/psutil,jorik041/psutil,Q-Leap-Networks/psutil,mrjefftang/psutil,jamesblunt/psutil,msarahan/psutil,cloudbase/psutil,packages/psutil,giampaolo/psutil,0-wiz-0/psutil,jorik041/psutil,giampaolo/psutil,0-wiz-0/psutil,packages/psutil,jamesblunt/psutil,msarahan/psutil,jamesblunt/psutil,cloudbase/psutil,qbit/psutil,msarahan/psutil,qbit/psutil