Image Promoter: Remove -it from docker command

It seems that the Image Promoter is running containers without the -t flag, which causes the error:

the input device is not a TTY

Removing the -it from the docker command in kubernetes/test/images/image-util.sh solves this.

test/images/image-util.sh

@@ -150,7 +150,7 @@ bin() {
   fi
   for SRC in "$@";
   do
-  docker run --rm -it -v "${TARGET}:${TARGET}:Z" -v "${KUBE_ROOT}":/go/src/k8s.io/kubernetes:Z \
+  docker run --rm -v "${TARGET}:${TARGET}:Z" -v "${KUBE_ROOT}":/go/src/k8s.io/kubernetes:Z \
         golang:"${GOLANG_VERSION}" \
         /bin/bash -c "\
                 cd /go/src/k8s.io/kubernetes/test/images/${SRC_DIR} && \