MINOR: peers: Add traces to peer_treat_updatemsg().

Add minimalistic traces for peers with only one event to diagnose potential
issues when decode peer update messages.

(cherry picked from commit d865935f3212f994d8868200d9a84315dbce1518)
[wt: also merge traces from f9e51beec and 1dfd4f10]
Signed-off-by: Willy Tarreau <w@1wt.eu>
1 file changed