netfilter: ipt_CLUSTERIP: deprecate it in favour of xt_cluster

xt_cluster supersedes ipt_CLUSTERIP since it can be also used in
gateway configurations (not only from the backend side).

ipt_CLUSTER is also known to leak the netdev that it uses on
device removal, which requires a rather large fix to workaround
the problem: http://patchwork.ozlabs.org/patch/358629/

So let's deprecate this so we can probably kill code this in the
future.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/include/net/netns/x_tables.h b/include/net/netns/x_tables.h
index c24060e..4d6597a 100644
--- a/include/net/netns/x_tables.h
+++ b/include/net/netns/x_tables.h
@@ -9,6 +9,7 @@
 struct netns_xt {
 	struct list_head tables[NFPROTO_NUMPROTO];
 	bool notrack_deprecated_warning;
+	bool clusterip_deprecated_warning;
 #if defined(CONFIG_BRIDGE_NF_EBTABLES) || \
     defined(CONFIG_BRIDGE_NF_EBTABLES_MODULE)
 	struct ebt_table *broute_table;