TBR: Update playground test to not use the deprecated rt.Logger() method.

Change-Id: I91ca68efffbfb756d2bf1cf36aa7b14fbf87aad2
diff --git a/testdata/src/ping/ping.go b/testdata/src/ping/ping.go
index 794d70a..b8a5ea2 100644
--- a/testdata/src/ping/ping.go
+++ b/testdata/src/ping/ping.go
@@ -5,6 +5,7 @@
 	"fmt"
 
 	_ "v.io/core/veyron/profiles"
+	"v.io/core/veyron2"
 	"v.io/core/veyron2/rt"
 
 	"pingpong"
@@ -16,8 +17,8 @@
 		panic(err)
 	}
 	defer runtime.Cleanup()
-
-	log := runtime.Logger()
+	ctx := runtime.NewContext()
+	log := veyron2.GetLogger(ctx)
 
 	s := pingpong.PingPongClient("pingpong")
 	pong, err := s.Ping(runtime.NewContext(), "PING")