common: add logging for peer packets, with status_io.

We log the plaintext, not the encrypted ones.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

lightningd/test/run-cryptomsg.c

@@ -46,6 +46,10 @@ void status_fmt(enum log_level level, const char *fmt, ...)
 	va_end(ap);
 }
 
+void status_io(enum log_level dir, const u8 *msg)
+{
+}
+
 #if DEVELOPER
 /* AUTOGENERATED MOCKS START */
 /* Generated stub for dev_blackhole_fd */