net: Move all of the network sysctls without a namespace into init_net.

This makes it clearer which sysctls are relative to your current network
namespace.

This makes it a little less error prone by not exposing sysctls for the
initial network namespace in other namespaces.

This is the same way we handle all of our other network interfaces to
userspace and I can't honestly remember why we didn't do this for
sysctls right from the start.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_netfilter.c

diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index dec4f38..4f4c4a6 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -1030,7 +1030,7 @@
 		return ret;
 	}
 #ifdef CONFIG_SYSCTL
-	brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table);
+	brnf_sysctl_header = register_net_sysctl_table(&init_net, brnf_path, brnf_table);
 	if (brnf_sysctl_header == NULL) {
 		printk(KERN_WARNING
 		       "br_netfilter: can't register to sysctl.\n");
@@ -1047,7 +1047,7 @@
 {
 	nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops));
 #ifdef CONFIG_SYSCTL
-	unregister_sysctl_table(brnf_sysctl_header);
+	unregister_net_sysctl_table(brnf_sysctl_header);
 #endif
 	dst_entries_destroy(&fake_dst_ops);
 }