libceph: add function to ensure notifies are complete
Without a way to flush the osd client's notify workqueue, a watch event that is unregistered could continue receiving callbacks indefinitely. Unregistering the event simply means no new notifies are added to the queue, but there may still be events in the queue that will call the watch callback for the event. If the queue is flushed after the event is unregistered, the caller can be sure no more watch callbacks will occur for the canceled watch. Signed-off-by: NJosh Durgin <josh.durgin@inktank.com> Reviewed-by: NSage Weil <sage@inktank.com> Reviewed-by: NAlex Elder <elder@linaro.org>
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