Convert builder images to go

Builder images converted to go commands. Main builder code in pkg/build/builder
Open an issue to fix that - duplicating this code is terrible.  And leave a TODO here to clear it all.

----- Original Message -----
> > @@ -0,0 +1,60 @@
> > +package cmd
> > +
> > +import (
> > +	"encoding/json"
> > +	"log"
> > +	"os"
> > +	"os/user"
> > +	"path/filepath"
> > +
> > +	"github.com/openshift/origin/pkg/build/api"
> > +	bld "github.com/openshift/origin/pkg/build/builder"
> > +)
> > +
> > +const DefaultDockerEndpoint = "unix:///var/run/docker.sock"
> > +const DockerCfgFile = ".dockercfg"
> 
> The methods in kubelet/dockertools/config.go are private
> (https://github.com/openshift/origin/blob/master/Godeps/_workspace/src/github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/dockertools/config.go)
> and publicly they're only accessible in the context of pulling an image
> (https://github.com/openshift/origin/blob/master/Godeps/_workspace/src/github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/dockertools/docker.go#L88)
> 
> ---
> Reply to this email directly or view it on GitHub:
> https://github.com/openshift/origin/pull/347/files#r19923928