Cleanup

Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Fix: Correctly wake-up the app when becoming established

We have to wakeup the application when the socket becomes established.
For this, in tcp_finish_connect, there is a call to sk_wake_async.
This was missing in mptcp_set_state.

Reported-by: Fabien Duchene <fabien.duchene@uclouvain.be>
Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>