chown'd the dorknet env file

docker/yolo/dorknet_kube_env.sh

@@ -4,6 +4,7 @@ source $ROS_WS/devel/setup.bash
 export PATH=$ROS_ROOT/bin:$PATH
 export ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:$ROS_WS
 export ROS_MASTER_URI=http://service-master:11311
-export ROS_HOSTNAME=service-dorknet
+# the "mario" here should really be an environment variable  
+export ROS_HOSTNAME=service-dorknet-mario
 export ROS_LOG_DIR=/root/.ros/log
 exec "$@"