Add an option to shutdown bgp in fwutil test

[congh-nvidia]

Description of PR

Summary: In some lab environment, when the bgp is running, the url of the components is not accessible from the dut. Add this option so we can shutdown bgp when necessary. By default, the bgp is not shutdown, same as the current flow.

Type of change

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

Back port request

• [ ] 201911
• [ ] 202012
• [ ] 202205
• [ ] 202305
• [ ] 202311

Approach

What is the motivation for this PR?

Please see the description.

How did you do it?

Add a pytest option.

How did you verify/test it?

Run the test with/without the option set, all passed.

Any platform specific information?

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

Documentation

[congh-nvidia]

/azpw run

[mssonicbld]

/AzurePipelines run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[liat-grozovik]

@congh-nvidia thanks for the fix. can you please explain why do we need to stop bgp during fw util tests?

[dprital]

@prgeor , Can you please review ?