bug fix: add node state check in getting node list
bug fix: add node state check in getting node list

skytap/heapster,Stackdriver/heapster,burmanm/heapster,AlmogBaku/heapster,andyxning/heapster,whuwxl/heapster,liubog2008/heapster,aegixx/heapster,bluebreezecf/heapster,taimir/heapster,andyxning/heapster,luxas/heapster,johanneswuerbach/heapster,Stackdriver/heapster,skytap/heapster,luxas/heapster,mwringe/heapster,shilpamayanna/heapster,whuwxl/heapster,mwringe/heapster,huangyuqi/heapster,liubog2008/heapster,aegixx/heapster,adfin/statster,AlmogBaku/heapster,saiwl/heapster,wulonghui/heapster,jackzampolin/heapster,bruceauyeung/heapster,johanneswuerbach/heapster,taimir/heapster,titilambert/heapster,saiwl/heapster,huangyuqi/heapster,jackzampolin/heapster,shilpamayanna/heapster,piosz/heapster,krzyzacy/heapster,burmanm/heapster,piosz/heapster,wulonghui/heapster,krzyzacy/heapster,adfin/statster,bluebreezecf/heapster,titilambert/heapster,bruceauyeung/heapster