pass a context to logging.Tracer.NewConnectionTracer

This context has the same value attached to it as the context returned
by Session.Context().
In the case of a dialed connection, this context is derived from the
context used for dialing.

integrationtests/self/tracer_test.go

@@ -25,7 +25,7 @@ type customTracer struct{}
 
 var _ logging.Tracer = &customTracer{}
 
-func (t *customTracer) TracerForConnection(p logging.Perspective, odcid logging.ConnectionID) logging.ConnectionTracer {
+func (t *customTracer) TracerForConnection(context.Context, logging.Perspective, logging.ConnectionID) logging.ConnectionTracer {
 	return &customConnTracer{}
 }
 func (t *customTracer) SentPacket(net.Addr, *logging.Header, logging.ByteCount, []logging.Frame) {}