Add a testcase for GNOI OS.Verify.

[hdwhdw]

Description of PR

Summary:
Add a testcase for GNOI OS.Verify.

Fixes # (issue)

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• [x ] 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?

Add a testcase for GNOI OS.Verify.

How did you do it?

Add a testcase for GNOI OS.Verify.

How did you verify/test it?

On physical switch:
with an up to date image

============================== warnings summary ===============================
../../../usr/local/lib/python3.8/dist-packages/paramiko/transport.py:236
  /usr/local/lib/python3.8/dist-packages/paramiko/transport.py:236: CryptographyDeprecationWarning: Blowfish has been deprecated
    "class": algorithms.Blowfish,

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
-- generated xml file: /data/sonic-mgmt-int/tests/logs/gnmi/test_gnoi_os.xml --
================== 1 passed, 1 warning in 631.44s (0:10:31) ===================

Any platform specific information?

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

Documentation

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[qiluo-msft]

It's fragile to use regex to extract a piece of json string. How about just skip first line and parse 2nd line as json string?

[hdwhdw]

Isn't that less tolerant to different outputs? Say someone would print:

System Time: {response json}

Or simply

{response json}

then the method won't work. The original method works as long as the first json substring is the response json, doesn't matter what you print before it (as long as it doesn't somehow contain another json).

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).