l2tp: Use consistent packet logging policy
Adapt packet logging policy to make it consistent across L2TP packet
handling functions:
* Don't log messages if conf_verbose is off.
* Log HELLO and ZLB messages with log_debug and use log_info2 for
any other message type.
* Log retransmissions with log_info2, no matter the message type.
* Log outgoing messages right before sending them.
* Log incoming messages right before analysing their message type.
This unifies the way l2tp_conn_read() and l2tp_udp_read() log
incoming messages.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>
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