Move the download of docker to top of dockerfile

We need to do this because it's a big dep.  While we remove this
recursive dep this is the best that we can do right now.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Dockerfile

@@ -3,6 +3,9 @@ FROM crosbymichael/golang
 RUN apt-get update && apt-get install -y gcc make
 RUN go get code.google.com/p/go.tools/cmd/cover
 
+ENV GOPATH $GOPATH:/go/src/github.com/docker/libcontainer/vendor
+RUN go get github.com/docker/docker/pkg/term
+
 # setup a playground for us to spawn containers in
 RUN mkdir /busybox && \
     curl -sSL 'https://github.com/jpetazzo/docker-busybox/raw/buildroot-2014.02/rootfs.tar' | tar -xC /busybox
@@ -14,8 +17,6 @@ COPY . /go/src/github.com/docker/libcontainer
 WORKDIR /go/src/github.com/docker/libcontainer
 RUN cp sample_configs/minimal.json /busybox/container.json
 
-ENV GOPATH $GOPATH:/go/src/github.com/docker/libcontainer/vendor
-
 RUN go get -d -v ./...
 RUN make direct-install