l2tp: convert l2tp_tunnel_list to idr

l2tp uses l2tp_tunnel_list to track all registered tunnels and
to allocate tunnel ID's. IDR can do the same job.

More importantly, with IDR we can hold the ID before a successful
registration so that we don't need to worry about late error
handling, it is not easy to rollback socket changes.

This is a preparation for the following fix.

Cc: Tetsuo Handa <[email protected]>
Cc: Guillaume Nault <[email protected]>
Cc: Jakub Sitnicki <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Tom Parkin <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
Reviewed-by: Guillaume Nault <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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