l2tp: close all race conditions in l2tp_tunnel_register()

In the Linux kernel, the following vulnerability has been resolved:

l2tp: close all race conditions in l2tp_tunnel_register()

The code in l2tp_tunnel_register() is racy in several ways:

1. It modifies the tunnel socket _after_ publishing it.

2. It calls setup_udp_tunnel_sock() on an existing socket without

locking.

3. It changes sock lock class on fly, which triggers many syzbot

reports.

This patch amends all of them by moving socket initialization code

before publishing and under sock lock. As suggested by Jakub, the

l2tp lockdep class is not necessary as we can just switch to

bh_lock_sock_nested().