LU-11838 llite: remove assert for acl refcount

LU-11838 llite: remove assert for acl refcount

The purpose of this asssert to was to ensure lustre
was properly managing its posix_acl access. This test
is invalid due to the VFS layer also taking references
on the posix_acl. In reality their is no simple way to
detect this class of mistakes.

* lastest kernels remove this refcount *

Linux-commit: 6a42e615a28bad49f2e04829486e94190c066390

This patch is back-ported from the following one:
Lustre-commit: df7bfbb1c7890deed15fd85e75da70d88be2ef7f
Lustre-change: https://review.whamcloud.com/34236

Change-Id: I167f2de449a2e8357517f33c2e81a25b25104d57
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Ben Evans <bevans@cray.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/35172
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>