message: admission control: use less iterations in integration test
diff: @@ -95,7 +95,7 @@ TEST_P(AdmissionControlIntegrationTest, HttpTest) {
  // Drop the success rate to a very low value.
  ENVOY_LOG(info, "dropping success rate");
  - for (int i = 0; i < 1000; ++i) {
  + for (int i = 0; i < 300; ++i) {
  sendRequestWithReturnCode("500");
  }
  @@ -103,7 +103,7 @@ TEST_P(AdmissionControlIntegrationTest, HttpTest) {
  double throttle_count = 0;
  double request_count = 0;
  ENVOY_LOG(info, "validating throttling rate");
  - for (int i = 0; i < 1000; ++i) {
  + for (int i = 0; i < 300; ++i) {
  auto response = sendRequestWithReturnCode("500");
  auto rc = response->headers().Status()->value().getStringView();
  if (rc == "503") {
  @@ -133,14 +133,14 @@ TEST_P(AdmissionControlIntegrationTest, GrpcTest) {
  initialize();
  // Drop the success rate to a very low value.
  - for (int i = 0; i < 1000; ++i) {
  + for (int i = 0; i < 300; ++i) {
  sendGrpcRequestWithReturnCode(14);
  }
  // Measure throttling rate from the admission control filter.
  double throttle_count = 0;
  double request_count = 0;
  - for (int i = 0; i < 1000; ++i) {
  + for (int i = 0; i < 300; ++i) {
  auto response = sendGrpcRequestWithReturnCode(10);
  // When the filter is throttling, it returns an HTTP code 503 and the GRPC status is unset.
  