-cover causes races in tests in Go 1.2

Make -covermode=atomic the default until we drop 1.2 support
Facepalm

> On Jul 11, 2014, at 2:53 PM, Dan Mace <notifications@github.com> wrote:
> 
> In hack/test-go.sh:
> 
> > @@ -35,14 +35,16 @@ find_test_dirs() {
> >    )
> >  }
> >  
> > +# -covermode=atomic becomes default with -race in Go >=1.3
> > +COVER="-cover -covermode=atomic -coverprofile=\"tmp.out\""
> Shouldn't this be KUBE_COVER?
> 
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