fix test failing on python 3
fix test failing on python 3

tigerneil/psutil,creativewild/psutil,vmolsa/psutil,huson2012/psutil,google-code-export/psutil,google-code-export/psutil,tigerneil/psutil,google-code-export/psutil,shiva21/psutil,jucapj/psutil,google-code-export/psutil,AlanZatarain/psutil,stupidcache/psutil,vmolsa/psutil,kiranvizru/psutil,Alwnikrotikz/psutil,kiranvizru/psutil,zhengzheng/psutil,marmolu/psutil,stupidcache/psutil,djhaskin987/psutil,tigerneil/psutil,nmani1905/psutil,creativewild/psutil,vmolsa/psutil,peter-hst/psutil,kiranvizru/psutil,skyshe/psutil,anfedorov/psutil,shiva21/psutil,djhaskin987/psutil,huson2012/psutil,tigerneil/psutil,chjwang/psutil,end18/psutil,PFZheng/psutil,vmolsa/psutil,djhaskin987/psutil,kiranvizru/psutil,nmani1905/psutil,Alwnikrotikz/psutil,creativewild/psutil,skyshe/psutil,PFZheng/psutil,huson2012/psutil,end18/psutil,end18/psutil,skyshe/psutil,skyshe/psutil,chjwang/psutil,marmolu/psutil,end18/psutil,anfedorov/psutil,AlanZatarain/psutil,djhaskin987/psutil,zhengzheng/psutil,stupidcache/psutil,peter-hst/psutil,jucapj/psutil