Fix integration test to use shortened hostnames for pushing docker images.
Fix integration test to use shortened hostnames for pushing docker images.

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