* Improve vxlan decap test. Make a test after vxlan removal

* Increase timeout time for vxlan-decap test

* Use docker exec to run redis-cli

Submodule src/sonic-utilities 7a2348c..4488525:
  > use vlan members (sonic-net#542)
  > [sonic_installer] If asked to install an image which is already installed, simply set as default (sonic-net#534)

Submodule src/sonic-swss 8246bd9..9c4ae18:
  > Ignore neighbor entry with BCAST MAC, check SAI status exists (sonic-net#914)

Signed-off-by: Ying Xie <[email protected]>

Make sure db_migrator is run after all config are loaded during (sonic-net#926)
Vnet alias mapping (sonic-net#924)
Changes to make lldp show command for multi-npu platforms. (sonic-net#914)
[Mellanox] Fix thermal control issue: use natural sort for fan
status and thermal status (sonic-net#836)
[Mellanox] add document for thermal control related cli (sonic-net#832)

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### Description of PR
https://nexthopai.atlassian.net/browse/NOS-4066
The fix simply checks for vlan interface and skips if not present.
Currently in our testbed DUTs we don't have VLAN interfaces, so skipping
the tests.
Later we can explore how to simulate vlan packets from ptf to DUT- may
be through QinQ.

Summary:
Fixes # (issue)
As described above

### Type of change

<!--
- Fill x for your type of change.
- e.g.
- [x] Bug fix
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- [x] Bug fix
- [ ] Testbed and Framework(new/improvement)
- [ ] New Test case
    - [ ] Skipped for non-supported platforms
- [ ] Test case improvement


### Back port request
- [ ] 202505
- [ ] 202511

### Approach
#### What is the motivation for this PR?
The motivation is to skip vlan based tests which are not supported in
the current testbeds.

#### How did you do it?
--

#### How did you verify/test it?
Ran the specific test on t1-8 topo gold404

```
 tests/qos/test_qos_sai.py::TestQosSai.testQosSaiDot1pQueueMapping[single_asic] s20% ██
 tests/qos/test_qos_sai.py::TestQosSai.testQosSaiDot1pQueueMapping[single_dut_multi_asic] s40% ████
 tests/qos/test_qos_sai.py::TestQosSai.testQosSaiDot1pQueueMapping[multi_dut_longlink_to_shortlink] s60% ██████
 tests/qos/test_qos_sai.py::TestQosSai.testQosSaiDot1pQueueMapping[multi_dut_shortlink_to_shortlink] s80% ████████
 tests/qos/test_qos_sai.py::TestQosSai.testQosSaiDot1pQueueMapping[multi_dut_shortlink_to_longlink] s100% ██████████
------------------ generated xml file: /tmp/test-logs/tr.xml -------------------
```

#### Any platform specific information?

#### Supported testbed topology if it's a new test case?

### Documentation
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Link to the wiki page?
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