[NETFILTER]: Switch to using ctl_paths in nf_queue and conntrack modules

This includes the most simple cases for netfilter.

The first part is tne queue modules for ipv4 and ipv6,
on which the net/ipv4/ and net/ipv6/ paths are reused
from the appropriate ipv4 and ipv6 code.

The conntrack module is also patched, but this hunk is
very small and simple.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index f2adedf..e371f32 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -112,6 +112,8 @@
 extern int sysctl_ipv6_bindv6only;
 extern int sysctl_mld_max_msf;
 
+extern struct ctl_path net_ipv6_ctl_path[];
+
 #define _DEVINC(statname, modifier, idev, field)			\
 ({									\
 	struct inet6_dev *_idev = (idev);				\