Admins may setup different pools for RGW objects and
having the StorageClass field mutable allows the steering
of RGW objects to the proper pools. This Lua example shows
how a user can modify the StorageClass header when
it is empty on a PUT request and steer objects to different
pools based on size (Request.ContentLength).
Signed-off-by: Curt Bruns <curt.e.bruns@gmail.com>
