Add mutable sinks endpoint integration test
Add mutable sinks endpoint integration test

nlamirault/heapster,mwielgus/heapster,whuwxl/heapster,shilpamayanna/heapster,saiwl/heapster,johanneswuerbach/heapster,liuhewei/heapster,luxas/heapster,a-robinson/heapster,vishh/heapster-1,relh/heapster,Huawei-PaaS/heapster,bluebreezecf/heapster,skytap/heapster,Stackdriver/heapster,titilambert/heapster,johanneswuerbach/heapster,Stackdriver/heapster,liubog2008/heapster,skytap/heapster,thucatebay/heapster,mwringe/heapster,burmanm/heapster,dalanlan/heapster,jfoy/heapster,fzu-huang/heapster,digideskio/heapster,jackzampolin/heapster,burmanm/heapster,afein/heapster,jackzampolin/heapster,a-robinson/heapster,piosz/heapster,liuhewei/heapster,wulonghui/heapster,nlamirault/heapster,piosz/heapster,vicki-c/heapster,dalanlan/heapster,whuwxl/heapster,mwielgus/heapster,apeeyush/heapster,luxas/heapster,wulonghui/heapster,afein/heapster,liubog2008/heapster,ravihansa3000/heapster,andyxning/heapster,shilpamayanna/heapster,titilambert/heapster,adfin/statster,relh/heapster,AlmogBaku/heapster,aegixx/heapster,mdshuai/heapster,bluebreezecf/heapster,bruceauyeung/heapster,ravihansa3000/heapster,bruceauyeung/heapster,huangyuqi/heapster,vishh/heapster-1,taimir/heapster,mwringe/heapster,saiwl/heapster,mdshuai/heapster,aegixx/heapster,AlmogBaku/heapster,naxhh/heapster,jfoy/heapster,apeeyush/heapster,thucatebay/heapster,krzyzacy/heapster,naxhh/heapster,krzyzacy/heapster,andyxning/heapster,huangyuqi/heapster,taimir/heapster,fzu-huang/heapster,digideskio/heapster,vicki-c/heapster,adfin/statster,Huawei-PaaS/heapster