wspr: Turn vtrace off by default until it can be more selective.

MultiPart: 2/2
Change-Id: Ida05e89dc3139ae7cd8595eca18fe7c195f247f5
diff --git a/services/wsprd/app/app.go b/services/wsprd/app/app.go
index fc15a23..3ad7fa7 100644
--- a/services/wsprd/app/app.go
+++ b/services/wsprd/app/app.go
@@ -197,7 +197,6 @@
 	response := VeyronRPCResponse{
 		OutArgs: results,
 		TraceResponse: vtrace.Response{
-			Flags: vtrace.CollectInMemory,
 			Trace: *traceRecord,
 		},
 	}
diff --git a/services/wsprd/app/app_test.go b/services/wsprd/app/app_test.go
index 03cdf46..89262ca 100644
--- a/services/wsprd/app/app_test.go
+++ b/services/wsprd/app/app_test.go
@@ -247,10 +247,8 @@
 
 func makeRPCResponse(outArgs ...*vdl.Value) string {
 	return lib.VomEncodeOrDie(VeyronRPCResponse{
-		OutArgs: outArgs,
-		TraceResponse: vtrace.Response{
-			Flags: vtrace.CollectInMemory,
-		},
+		OutArgs:       outArgs,
+		TraceResponse: vtrace.Response{},
 	})
 }