[T2] Multi-asic support for everflow IPV6 mirror-session config tests

[sanjair-git]

Description of PR

Summary:
Fixes # (issue)

• This PR adds multi-asic support for mirror configuration in everfow tests.
• It applies to 'erspan-ipv6' tests under 'test_everflow_testbed' and 'test_everflow_ipv6' test suites.

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• New Test case
  • Skipped for non-supported platforms
• Test case improvement

Back port request

• 202012
• 202205
• 202305
• 202311
• 202405
• 202411

Approach

What is the motivation for this PR?

• All 'erspan ipv6' evverflow tests were failing for multi-asic duts with the following error.

E               acl_loader.set_session_name(session_name)
E             File "/usr/local/lib/python3.11/dist-packages/acl_loader/main.py", line 326, in set_session_name
E               raise AclLoaderException("Session %s does not exist" % session_name)
E           acl_loader.main.AclLoaderException: Session test_session_1 does not exist

How did you do it?

• If the duthost has multiple asics, apply the mirror config on each asic.
• And also add the 'ERSPAN' session type in the mirror config.

How did you verify/test it?

• Ran the tests on T2 multi-asic dut and made sure tests are passing.

Any platform specific information?

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

Documentation

[mssonicbld]

/azp run

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[mssonicbld]

/azp run

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[mssonicbld]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).

[sanjair-git]

Trigger /azp failed. Can you please help in rerunning /azp run. Thanks

[tjchadaga]

/azpw run

[mssonicbld]

/AzurePipelines run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[sanjair-git]

Closing this PR as the changes are being taken care in #19594 with some additional changes for erspan.