(OSX) add a test for total swap memory
(OSX) add a test for total swap memory

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