receiver/opencensus: Restore gRPC Gateway test. (#507)
receiver/opencensus: Restore gRPC Gateway test. (#507)


open-telemetry/opentelemetry-collector-contrib,census-instrumentation/opencensus-service,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector-contrib,census-instrumentation/opencensus-service,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector