Revert "LU-2600 osd-zfs: batched object accounting"

This is causing lu-4968

This reverts commit 72accbebccb6a542b327e45e9a0903b2951d4bd5.

Change-Id: I039787943f84babcb5dadd1c75b12b0e8fa0e1f0
Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Reviewed-on: http://review.whamcloud.com/10271
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>