Delete RCs in the integration tests by label, not name
Delete RCs in the integration tests by label, not name

The name can change (e.g. in Kubernetes 1.0.1 it's "monitoring-heapster-v5"
while it used to be "monitoring-heapster") so it is simply not good enough to
find the correct RCs.

Defaulting to "heapster", we take the value of either "k8s-app" or "name" from
the given RC config labels. Then we find exactly one RC that matches either
k8s-app=heapster or name=heapster and we proceed to delete it.

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