message: update update_test_baseline.sh to respect new test_image_data folder
diff: #
  md5=`md5sum $2/$1.png | awk '{print $1 }'`
  echo $md5
  -echo $md5 > $3/tests/baseline/$1.png.md5
  +echo $md5 > $3/test_image_data/baseline/$1.png.md5
  rsync --rsync-path="sudo rsync" --chown=web:web $2/$1.png sdvis.org:/var/www/html/ospray/download/baseline/benchmark-data/MD5/$md5
  