[202205 xfail] test_tor_ecn xfail for 202205 branch

[StormLiangMS]

Description This issue is to track test_tor_ecn failure for 202205 branch. dualtor/test_tor_ecn.py::test_dscp_to_queue_during_encap_on_standby:

dualtor/test_tor_ecn.py::test_ecn_during_encap_on_standby:

Steps to reproduce the issue: 1. 2. 3.

Describe the results you received:

Describe the results you expected:

Additional information you deem important:

**Output of `show version`:**

```
(paste your output here)
```

**Attach debug file `sudo generate_dump`:**

```
(paste your output here)
```

[ZhaohuiS]

Fix it in https://github.com/sonic-net/sonic-mgmt/pull/6906

StartTime | TestbedName | OSVersion | AsicType | TopologyType | Result | TestCase | FullTestPath -- | -- | -- | -- | -- | -- | -- | -- 2022-12-09 23:41:50.9900590 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_ecn_during_encap_on_standby[2] | dualtor.test_tor_ecn.test_ecn_during_encap_on_standby[2] 2022-12-09 23:28:46.9897820 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_dscp_to_queue_during_decap_on_active[4] | dualtor.test_tor_ecn.test_dscp_to_queue_during_decap_on_active[4] 2022-12-09 23:42:56.7107360 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_ecn_during_encap_on_standby[6] | dualtor.test_tor_ecn.test_ecn_during_encap_on_standby[6] 2022-12-09 23:40:47.7748310 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_ecn_during_encap_on_standby[4] | dualtor.test_tor_ecn.test_ecn_during_encap_on_standby[4] 2022-12-09 23:39:48.2883500 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_ecn_during_encap_on_standby[3] | dualtor.test_tor_ecn.test_ecn_during_encap_on_standby[3] 2022-12-09 23:38:58.6839870 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_ecn_during_decap_on_active[6] | dualtor.test_tor_ecn.test_ecn_during_decap_on_active[6] 2022-12-09 23:38:07.1064760 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_ecn_during_decap_on_active[2] | dualtor.test_tor_ecn.test_ecn_during_decap_on_active[2] 2022-12-09 23:37:15.8070520 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_ecn_during_decap_on_active[4] | dualtor.test_tor_ecn.test_ecn_during_decap_on_active[4] 2022-12-09 23:25:20.7074190 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_dscp_to_queue_during_decap_on_active[3] | dualtor.test_tor_ecn.test_dscp_to_queue_during_decap_on_active[3] 2022-12-09 23:35:20.7310600 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_dscp_to_queue_during_encap_on_standby[6] | dualtor.test_tor_ecn.test_dscp_to_queue_during_encap_on_standby[6] 2022-12-09 23:34:16.4268940 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_dscp_to_queue_during_encap_on_standby[2] | dualtor.test_tor_ecn.test_dscp_to_queue_during_encap_on_standby[2] 2022-12-09 23:33:08.0690650 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_dscp_to_queue_during_encap_on_standby[4] | dualtor.test_tor_ecn.test_dscp_to_queue_during_encap_on_standby[4] 2022-12-09 23:36:24.5441480 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_ecn_during_decap_on_active[3] | dualtor.test_tor_ecn.test_ecn_during_decap_on_active[3] 2022-12-09 23:32:00.5842020 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_dscp_to_queue_during_encap_on_standby[3] | dualtor.test_tor_ecn.test_dscp_to_queue_during_encap_on_standby[3] 2022-12-09 23:30:55.5193440 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_dscp_to_queue_during_decap_on_active[6] | dualtor.test_tor_ecn.test_dscp_to_queue_during_decap_on_active[6] 2022-12-09 23:29:51.5362760 | vms21-dual-t0-7260 | master.186256-7db272556 | broadcom | dualtor | success | test_dscp_to_queue_during_decap_on_active[2] | dualtor.test_tor_ecn.test_dscp_to_queue_during_decap_on_active[2]