quorum: Implement .bdrv_co_readv/writev
This converts the quorum block driver from implementing callback-based interfaces for read/write to coroutine-based ones. This is the first step that will allow us further simplification of the code. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NAlberto Garcia <berto@igalia.com>
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