net ipv4: Convert ipv4.ip_local_port_range to be per netns v3

- Move sysctl_local_ports from a global variable into struct netns_ipv4.
- Modify inet_get_local_port_range to take a struct net, and update all
  of the callers.
- Move the initialization of sysctl_local_ports into
   sysctl_net_ipv4.c:ipv4_sysctl_init_net from inet_connection_sock.c

v2:
- Ensure indentation used tabs
- Fixed ip.h so it applies cleanly to todays net-next

v3:
- Compile fixes of strange callers of inet_get_local_port_range.
  This patch now successfully passes an allmodconfig build.
  Removed manual inlining of inet_get_local_port_range in ipv4_local_port_range

Originally-by: Samya <samya@twitter.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

security/selinux/hooks.c

@@ -3929,7 +3929,7 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
 		if (snum) {
 			int low, high;
 
-			inet_get_local_port_range(&low, &high);
+			inet_get_local_port_range(sock_net(sk), &low, &high);
 
 			if (snum < max(PROT_SOCK, low) || snum > high) {
 				err = sel_netport_sid(sk->sk_protocol,