[VLAN][SW_MODE]: Switchport mode tests

[cshivashgit]

Tests have been added to verify interface mode configurations using "show interfaces switchport status" and "show interfaces status" commands

Fix is proposed through PR: sonic-net/sonic-utilities#3788

Description of PR

Summary: show interface state always show port as trunk port
Fixes # (issue)
Added new tests to verify interface's switchport status

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?

Interface mode change was not showing proper output in "show interfaces status"

How did you do it?

Found out the issue in intfutil.

"Vlan" column in "show interface status" is displayed based on below considerations:

1. If interface is part of PortChannel - display PortChannel interface name [present behavior]
2. If "switchport mode" is configured on interface [Ethernet/PortChannel] - display configured mode [new behavior]
3. If "switchport mode" is NOT configured on interface but part of a VLAN [Ethernet/PortChannel] - display as "trunk" [present behavior]

How did you verify/test it?

Ran test on T0 setup.

Any platform specific information?

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

Documentation

[mssonicbld]

/azp run

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[cshivashgit]

/azp run

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