switch cloud functions test to simple span processor to fix tests (#270)

Author: dashpole

e2e-test-server/src/main/java/com/google/cloud/opentelemetry/endtoend/ScenarioHandlerManager.java

@@ -31,7 +31,7 @@
 import io.opentelemetry.sdk.autoconfigure.AutoConfiguredOpenTelemetrySdk;
 import io.opentelemetry.sdk.resources.Resource;
 import io.opentelemetry.sdk.trace.SdkTracerProvider;
-import io.opentelemetry.sdk.trace.export.BatchSpanProcessor;
+import io.opentelemetry.sdk.trace.export.SimpleSpanProcessor;
 import io.opentelemetry.sdk.trace.export.SpanExporter;
 import java.io.IOException;
 import java.time.Duration;
@@ -228,7 +228,7 @@ private static OpenTelemetrySdk setupTraceExporter(Resource resource) throws IOE
                     new XCloudTraceContextPropagator(true))))
         .setTracerProvider(
             SdkTracerProvider.builder()
-                .addSpanProcessor(BatchSpanProcessor.builder(traceExporter).build())
+                .addSpanProcessor(SimpleSpanProcessor.create(traceExporter))
                 .setResource(resource)
                 .build())
         .build();