LU-3892 ofd: setattr doesn't need to return attributes

LU-3892 ofd: setattr doesn't need to return attributes

the root cause of the problem is that getattr finds the
object being already destroyed, so we have transno from
preceeding setattr and -ENOENT from getattr and this
confuses OSP.

there is actually no need in attributes in the reply.

Signed-off-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Change-Id: Ib059a443af164d0def58fdfbf41ab545c057cd10
Reviewed-on: http://review.whamcloud.com/7672
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Johann Lombardi <johann.lombardi@intel.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>