message: Fix for an intermittently failing integration test
  This is fix for intermittent failures in a vhds_integration_test: VhdsVirtualHostAddUpdateRemove.
diff: @@ -187,6 +187,8 @@ public:
  compareDeltaDiscoveryRequest(Config::TypeUrl::get().VirtualHost, {}, {}, vhds_stream_));
  sendDeltaDiscoveryResponse<envoy::api::v2::route::VirtualHost>({buildVirtualHost()}, {}, "1",
  vhds_stream_);
  + EXPECT_TRUE(
  + compareDeltaDiscoveryRequest(Config::TypeUrl::get().VirtualHost, {}, {}, vhds_stream_));
  // Wait for our statically specified listener to become ready, and register its port in the
  // test framework's downstream listener port map.
  