Update Ubuntu version in hbase Docker container

git-svn-id: https://svn.apache.org/repos/asf/nutch/branches/2.x@1723931 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/docker/hbase/Dockerfile b/docker/hbase/Dockerfile
index b642d1d..61d9379 100644
--- a/docker/hbase/Dockerfile
+++ b/docker/hbase/Dockerfile
@@ -13,8 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from stackbrew/ubuntu:saucy
-MAINTAINER Radoslaw Stankiewicz <rrydziu@gmail.com>
+from ubuntu:14.04
+MAINTAINER Nutch Developers <dev@nutch.apache.org>
 
 WORKDIR /root/