complete kernel task cleanup

This change was omitted from "kernel task cleanup"

commit eeae337751cc7fc5d7bbd10dceb4db1caa53fe20
Author: Shlomo Pongratz <shlomop@mellanox.com>
Date:   Tue Aug 26 14:00:19 2014 +0300

Change-Id: I9b4ec16d1e2ac9701ff3c2770dde33e138886c69
Signed-off-by: Shlomo Pongratz <shlomop@mellanox.com>