Convert builder images to go

Builder images converted to go commands. Main builder code in pkg/build/builder
That's fine, but can you add them for future use upstream?

----- Original Message -----
> > @@ -0,0 +1,171 @@
> > +package builder
> > +
> > +import (
> > +	"io/ioutil"
> > +	"os"
> > +	"testing"
> > +
> > +	kapi "github.com/GoogleCloudPlatform/kubernetes/pkg/api"
> > +	"github.com/fsouza/go-dockerclient"
> > +	"github.com/openshift/origin/pkg/build/api"
> > +)
> > +
> > +type FakeDocker struct {
> 
> The FakeDocker in k8s doesn't include the methods I need here: BuildImage and
> PushImage
> 
> ---
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> https://github.com/openshift/origin/pull/347/files#r19923433