rbd: adjust image object request ref counting

An extra reference is taken when an object request is added as one
of the requests making up an image object.  A reference is dropped
again when the image's object requests get submitted.

The original reference for the object request will remain throughout
this period, so we don't need to add and then take away an extra
one.

This can be interpreted as the image request inheriting the original
object request's reference.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>