added virtual memory tests for freebsd
added virtual memory tests for freebsd

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