Added test mode
Added test mode

test mode for debugging and testing sink output
luxas/heapster,luxas/heapster,huangyuqi/heapster,andyxning/heapster,AlmogBaku/heapster,piosz/heapster,whuwxl/heapster,andyxning/heapster,Stackdriver/heapster,whuwxl/heapster,bruceauyeung/heapster,krzyzacy/heapster,johanneswuerbach/heapster,piosz/heapster,johanneswuerbach/heapster,adfin/statster,burmanm/heapster,adfin/statster,huangyuqi/heapster,AlmogBaku/heapster,bluebreezecf/heapster,Stackdriver/heapster,burmanm/heapster,krzyzacy/heapster,bluebreezecf/heapster,bruceauyeung/heapster