Merge IPFilter 5.1.2 into HEAD

branches: 1.1.1;
Initial revision

Import IPFilter 5.1.2

branches: 1.1.1.1.2;
import 5.1.1

sync with head

sync with head

file ipfsyncd.c was added on branch yamt-pagecache on 2012-04-17 00:03:26 +0000