rbd: add img_req->op_type field

Store op_type in its own field instead of packing it into flags.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2018-01-30 17:52:10 +01:00
commit 9bb0248d9e