This adds merge_backward "start", "complete", "update_eventfd" and
"cancel" commands. By that we are able to split single merge_backward
into two stages: start asyncronous merging and completion. That can be
usefull for restarting qemu process while allowing backward merging to
run asyncronously in
Note: This was detected by updated test:
https://bitbucket.org/virtuozzocore/dm-qcow2-merge-backward-testing/src/master/test-v5.sh
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