Previously the ssync Sender would attempt to revert all objects in a
partition within a single SSYNC request. With this change the
reconstructor daemon option max_objects_per_revert can be used to limit
the number of objects reverted inside a single SSYNC request for revert
type jobs i.e. when reverting handoff partitions.
If more than max_objects_per_revert are available, the remaining objects
will remain in the sender partition and will not be reverted until the
next call to ssync.Sender, which would currrently be the next time the
reconstructor visits that handoff partition.
Note that the option only applies to handoff revert jobs, not to sync
jobs.
Change-Id: If81760c80a4692212e3774e73af5ce37c02e8aff
8ee631ccee