fix test failure on BSD where pid 0 has 1 thread active
fix test failure on BSD where pid 0 has 1 thread active

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