LU-11934 mdc: don't use ACL at setattr

LU-11934 mdc: don't use ACL at setattr

For ldiskfs with large_ea, EA max size is equal to 1MB.
At mdc_setattr ptlrpc reply size is 1.1MB and it is rounded
to 2MB. So REINT_SETATTR request takes about 2MB of memory at
client. For a MDS failover case many request stay at reply queue
and could lead to OOM.

The patch changes acl size to zero, cause server doesn't fill
acl for setattr request.

Signed-off-by: Alexander Boyko <c17825@cray.com>
Change-Id: Id37ee07d743371a03c0c2d14f462bdd13afe1ef6
Cray-bug-id: LUS-6938
Reviewed-on: https://review.whamcloud.com/34194
Reviewed-by: Andrew Perepechko <c17827@cray.com>
Reviewed-by: Andriy Skulysh <c17819@cray.com>
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>