Enable race detector in CI
Enable race detector in CI

This adds race detection to the coverage target.

Signed-off-by: Aaron Lehmann <8ecfc6017a87905413dcd7d63696a2a4c351b604@docker.com>

yongtang/swarmkit,deljuven/swarmkit,deljuven/swarmkit,elifa/swarmkit,RenaudWasTaken/swarmkit,docker/swarmkit,alyyousuf7/swarmkit,aaronlehmann/swarmkit,aaronlehmann/swarmkit,cezarsa/swarmkit,diogomonica/swarmkit,yp-engineering/swarmkit,diogomonica/swarmkit,cheyang/swarmkit,elifa/swarmkit,Noyan759/swarmkit,sungwonh/swarmkit,cheyang/swarmkit,jlhawn/swarmkit,AliyunContainerService/swarmkit,Noyan759/swarmkit,cezarsa/swarmkit,vasil-yordanov/swarmkit,fate-grand-order/swarmkit,allencloud/swarmkit,AliyunContainerService/swarmkit,fate-grand-order/swarmkit,runshenzhu/swarmkit,dperny/swarmkit-1,yongtang/swarmkit,sungwonh/swarmkit,jlhawn/swarmkit,dperny/swarmkit-1,vasil-yordanov/swarmkit,RenaudWasTaken/swarmkit,yp-engineering/swarmkit,docker/swarmkit,allencloud/swarmkit,runshenzhu/swarmkit,alyyousuf7/swarmkit