s3-winbindd: Fix #10264, cache_traverse_validate_fn failure for NDR cache entries.

s3-winbindd: Fix #10264, cache_traverse_validate_fn failure for NDR cache entries.

We need to increase the keysize limit for NDR queries. A wbint_LookupSids query
for just 20 sids already hits the older limit.

Guenther

https://bugzilla.samba.org/show_bug.cgi?id=10264
Signed-off-by: Günther Deschner <gd@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
Autobuild-User(master): Michael Adam <obnox@samba.org>
Autobuild-Date(master): Wed Nov 13 19:33:46 CET 2013 on sn-devel-104
(cherry picked from commit 944e9fbc20f125b52e047484dca1792d75561ed9)