[NETNS][FRAGS]: Duplicate sysctl tables for new namespaces.

Each namespace has to have own tables to tune their
different parameters, so duplicate the tables and
register them.

All the tables in sub-namespaces are temporarily made
read-only.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/net/netns/ipv4.h
Simple merge

diff --cc include/net/netns/ipv6.h
Simple merge

diff --cc net/ipv4/ip_fragment.c
Simple merge

diff --cc net/ipv6/reassembly.c
Simple merge