Revert "working"

This reverts commit d3942ae954e9dd05adff64eeabede3bff79c4d38.
MOSDOp: drop ops vector in clear_payload()

Otherwise, clear_payload on MOSDOp will leave essentially
all of the buffers intact.  This is a problem since the
OpTracker mechanism relies on being able to keep the mesage
around without keeping around the data.

Signed-off-by: Samuel Just <sam.just@inktank.com>
OpTracker: if !tracking_enabled, don't leak the message

Signed-off-by: Samuel Just <sam.just@inktank.com>