[IPV6]: Use sysctl paths to register ipv6 sysctl tables

I have already done this for core, ipv4 and tr tables, so repeat this
for the ipv6 ones.

This makes the ipv6.ko smaller and creates the ground needed for net
namespaces support in ipv6.ko ssctls.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/sysctl_net_ipv6.c

@@ -82,31 +82,17 @@ static ctl_table ipv6_table[] = {
 	{ .ctl_name = 0 }
 };
 
-static struct ctl_table_header *ipv6_sysctl_header;
-
-static ctl_table ipv6_net_table[] = {
-	{
-		.ctl_name	= NET_IPV6,
-		.procname	= "ipv6",
-		.mode		= 0555,
-		.child		= ipv6_table
-	},
-	{ .ctl_name = 0 }
+static struct ctl_path ipv6_ctl_path[] = {
+	{ .procname = "net", .ctl_name = CTL_NET, },
+	{ .procname = "ipv6", .ctl_name = NET_IPV6, },
+	{ },
 };
 
-static ctl_table ipv6_root_table[] = {
-	{
-		.ctl_name	= CTL_NET,
-		.procname	= "net",
-		.mode		= 0555,
-		.child		= ipv6_net_table
-	},
-	{ .ctl_name = 0 }
-};
+static struct ctl_table_header *ipv6_sysctl_header;
 
 void ipv6_sysctl_register(void)
 {
-	ipv6_sysctl_header = register_sysctl_table(ipv6_root_table);
+	ipv6_sysctl_header = register_sysctl_paths(ipv6_ctl_path, ipv6_table);
 }
 
 void ipv6_sysctl_unregister(void)