For a reconstructor revert job, if sync'd to sufficient other nodes,
the handoff partition is considered done and handoffs_remaining is not
incremented. With the new max_objects_per_revert option [1], a ssync
job may appear to be complete but not all objects have yet been
reverted, so handoffs remaining should be incremented.
[1] Related-Change: If81760c80a4692212e3774e73af5ce37c02e8aff
Change-Id: I59572f75b9b0ba331369eb7358932943b7935ff0