LU-7899 osd: batch EA updates

during file creation we set number of EAs: LMA, VBR, LinkEA, LOVEA, ACLs.
calling into SA to refill spill again and again is expensive. thus it
makes sense to postpone this to osd_trans_stop() where all changed EAs
has been already collected in a temporary buffer.

Change-Id: Ia2604ddafdf8b2ca4f6db4d70ead6d2d2761cd26
Signed-off-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-on: http://review.whamcloud.com/19143
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: https://review.whamcloud.com/21893