fix limited user test case when test suite is run as root
fix limited user test case when test suite is run as root

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