[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/ip.h b/include/net/ip.h
index cbeb97d..6850a80 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -177,6 +177,8 @@
 extern int sysctl_ip_default_ttl;
 extern int sysctl_ip_nonlocal_bind;
 
+extern struct ctl_path net_ipv4_ctl_path[];
+
 /* From ip_fragment.c */
 struct inet_frags_ctl;
 extern struct inet_frags_ctl ip4_frags_ctl;