In a0fd72eb5e I added a diagnostic message if messages cause large
delays, *but* I didn't set the "peer_in_lasttime" variable in the case
of locally-handled packets.
I really want this in the release: the point of this was to try to
diagnose some high-latency ping issues we've seen on the real network.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>