update pip installation by easy_install
update pip installation by easy_install

zstackio/zstack,myxyz/zstack,ghxandsky/zstack,Alvin-Lau/zstack,zstackio/zstack,MaJin1996/zstack,mingjian2049/zstack,icanfly/zstack,liningone/zstack,hhjuliet/zstack,zstackorg/zstack,zxwing/zstack-1,no2key/zstack,fishky/zstack,AlanJinTS/zstack,WangXijue/zstack,zstackorg/zstack,winger007/zstack,winger007/zstack,zsyzsyhao/zstack,zstacktest/zstack,cloudcache/zstack,zsyzsyhao/zstack,AlanJinTS/zstack,MatheMatrix/zstack,cloudcache/zstack,HeathHose/zstack,AlanJager/zstack,newbiet/zstack,no2key/zstack,fishky/zstack,ghxandsky/zstack,icanfly/zstack,OnePaaS/zstack,MatheMatrix/zstack,zxwing/zstack-1,HeathHose/zstack,camilesing/zstack,Alvin-Lau/zstack,liningone/zstack,zstacktest/zstack,mingjian2049/zstack,myxyz/zstack,MatheMatrix/zstack,AlanJager/zstack,OnePaaS/zstack,WangXijue/zstack,MaJin1996/zstack,mingjian2049/zstack,HeathHose/zstack,newbiet/zstack,zstackio/zstack,liningone/zstack,camilesing/zstack,AlanJager/zstack,WangXijue/zstack,AlanJinTS/zstack,camilesing/zstack,zxwing/zstack-1,hhjuliet/zstack,Alvin-Lau/zstack