adds test case for pid attribute and __str__ method of AD and NSP exceptions
adds test case for pid attribute and __str__ method of AD and NSP exceptions

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