Immediately fail when op state is not found

Immediately fail when op state is not found

There's a very narrow window in which our connection sending the copy
request could fail before radosgw records the op state, and we query
the op state in that time. Retrying later at that point is fine, and
avoids a long timeout if there is a bug causing us to reach this point
without the op state ever being recorded. This race hasn't been
observed in practice.

Signed-off-by: Josh Durgin <jdurgin@redhat.com>