message: test: fix rbac flake
  The write can see disconnect upon completion.
  Fixes
  Risk Level: None
  Testing: Existing test
  Docs Changes: N/A
  Release Notes: N/A
diff: @@ -122,7 +122,7 @@ typed_config:
  - any: true
  )EOF");
  IntegrationTcpClientPtr tcp_client = makeTcpConnection(lookupPort("listener_0"));
  - ASSERT_TRUE(tcp_client->write("hello"));
  + ASSERT_TRUE(tcp_client->write("hello", false, false));
  tcp_client->waitForDisconnect();
  EXPECT_EQ(0U, test_server_->counter("tcp.rbac.allowed")->value());
  