hack/make: fix test-unit target to propogate TESTFLAGS properly

`TESTFLAGS=-test.v make test-unit` currently does not echo the (very useful) output of `go test -v`. This fixes it.

/cc @tianon 
Yeah. Wiring that up now.

On Sep 2, 2014, at 11:00 AM, Tibor Vass <notifications@github.com> wrote:

> In hack/make/test-unit:
> 
> > @@ -56,7 +56,7 @@ go_run_test_dir() {
> >  		echo
> >  		echo '+ go test' $TESTFLAGS "${DOCKER_PKG}${dir#.}"
> >  		precompiled="$DEST/precompiled/$dir.test"
> > -		if ! ( cd "$dir" && "$precompiled" ); then
> > +		if ! ( cd "$dir" && $precompiled $TESTFLAGS); then
> Agreed. 
> 
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