inet: make no_pmtu_disc per namespace and kill ipv4_config

The other field in ipv4_config, log_martians, was converted to a
per-interface setting, so we can just remove the whole structure.

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/netns/ipv4.h

@@ -69,6 +69,7 @@ struct netns_ipv4 {
 	struct local_ports sysctl_local_ports;
 
 	int sysctl_tcp_ecn;
+	int sysctl_ip_no_pmtu_disc;
 
 	kgid_t sysctl_ping_group_range[2];