Don't run make twice
Don't run make twice

The Makefile is dumb as far as targets go, so running make multiple times will
result in re-running the targets "clean deps sanitize build", which results in
re-running all the sanity checks and the build itself.

This should speed up travis a good 10-20s.

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