Add glusterfs-client in hyperkube image.

To make glusterfs volume workable when running kubernetes in a docker container.

cluster/images/hyperkube/Dockerfile

@@ -29,6 +29,7 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get update -y \
     socat \
     git \
     nfs-common \
+    glusterfs-client \
     && DEBIAN_FRONTEND=noninteractive apt-get upgrade -y \
     && DEBIAN_FRONTEND=noninteractive apt-get autoremove -y \
     && DEBIAN_FRONTEND=noninteractive apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*