message: test: fix http_timeout_integration_test flake
  Fixes
diff: @@ -282,7 +282,7 @@ TEST_P(HttpTimeoutIntegrationTest, PerTryTimeoutWithoutGlobalTimeout) {
  {"x-forwarded-for", "10.0.0.1"},
  {"x-envoy-retry-on", "5xx"},
  {"x-envoy-upstream-rq-timeout-ms", "0"},
  - {"x-envoy-upstream-rq-per-try-timeout-ms", "5"}});
  + {"x-envoy-upstream-rq-per-try-timeout-ms", "50"}});
  auto response = std::move(encoder_decoder.second);
  request_encoder_ = &encoder_decoder.first;
  @@ -294,11 +294,11 @@ TEST_P(HttpTimeoutIntegrationTest, PerTryTimeoutWithoutGlobalTimeout) {
  ASSERT_TRUE(upstream_request_->waitForEndStream(*dispatcher_));
  // Trigger per try timeout (but not global timeout) and wait for reset.
  - timeSystem().advanceTimeWait(std::chrono::milliseconds(5));
  + timeSystem().advanceTimeWait(std::chrono::milliseconds(50));
  ASSERT_TRUE(upstream_request_->waitForReset());
  // Wait for a second request to be sent upstream. Max retry backoff is 25ms so advance time that
  - // much.
  + // much. This is always less than the next request's per try timeout.
  timeSystem().advanceTimeWait(std::chrono::milliseconds(25));
  ASSERT_TRUE(fake_upstream_connection_->waitForNewStream(*dispatcher_, upstream_request_));
  ASSERT_TRUE(upstream_request_->waitForHeadersComplete());
  