added script to import raw images to docker

docker/img2docker.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+#
+# This script imports a raw image into Docker.  It takes two
+# arguments: the name of the image file, and the tag to assign to the
+# Docker image that it creates.
+
+usage() {
+    echo "usage: $(basename $0) <image> <tag>"
+    exit 1
+}
+
+image="$1"
+tag="$2"
+
+if [[ -z $1 || -z $2 ]]; then
+    usage
+fi
+
+mount="$(mktemp -d --tmpdir)"
+mount -o loop "$image" "$mount"
+
+cd "$mount"
+tar -cpSf - --acls --selinux --xattrs * | docker import - "$tag"
+cd -
+umount "$mount"
+rmdir "$mount"