LU-5683 llite: Report first encountered error

LU-5683 llite: Report first encountered error

Failures in ll_ioc_copy_{start,end} are reported to coordinator.
The return code delivered to the caller should indicate what this
error was, not whether coordinator was succesfully notified.

Signed-off-by: Henri Doreau <henri.doreau@cea.fr>
Change-Id: Iffcfe060be25ac071c7c314f33607292ed314d6a
Reviewed-on: http://review.whamcloud.com/14335
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>