MD5 checksum of the image
When present, Glance will verify the checksum generated from the backend store when storing your image against
this value and return a 400 Bad Request if the values do not match.
Glance normally sets the owner of an image to be the tenant or user (depending on the “owner_is_tenant”
configuration option) of the authenticated user issuing the request.
Upload image data for a previously-reserved image
If an image was previously reserved, and thus is in the queued state, then
image data can be added using this method.