rbd: implement watch/unwatch with new code
Implement a new function to set up or tear down a watch event for an mapped rbd image header using the new request code. Create a new object request type "nodata" to handle this. And define rbd_osd_trivial_callback() which simply marks a request done. Signed-off-by: NAlex Elder <elder@inktank.com> Reviewed-by: NJosh Durgin <josh.durgin@inktank.com>
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