filesystem-layout: make /var check more strict

We only banned subdirs previously.  Now ban it from being created at all.

BUG=b:187699610
TEST=CQ passes

Change-Id: I221dc8ecbdb31faf4e19f62a662a1bee54f86c85
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/3626128
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Sergey Frolov <sfrolov@google.com>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed