[Fanout] Update Arista-7260CX3 leaf fanout template for breakout 4x 10G interface

[lizhijianrd]

Description of PR

Summary: Update Arista-7260CX3 leaf fanout configuration template for breakout 4x 10G interface. Fix the template for situation that not all the 4 breakout interface are being used.

Type of change

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

Back port request

• [ ] 202012
• [ ] 202205
• [ ] 202305
• [ ] 202311
• [ ] 202405

Approach

What is the motivation for this PR?

Update Arista-7260CX3 leaf fanout configuration template for breakout 4x 10G interface. Fix the template for situation that not all the 4 breakout interface are being used.

How did you do it?

Update the j2 template file.

How did you verify/test it?

Verified on physical Arista-7260CX3 fanout switch. Snippet of generated configuration:

...
interface Ethernet9/1
   description DUT-1-Ethernet51
   speed forced 10000full
   switchport access vlan 668
   switchport mode dot1q-tunnel
   spanning-tree portfast
!
interface Ethernet9/2
   shutdown
!
interface Ethernet9/3
   description DUT-2-Ethernet51
   speed forced 10000full
   switchport access vlan 772
   switchport mode dot1q-tunnel
   spanning-tree portfast
!
interface Ethernet9/4
   shutdown
!
...

Any platform specific information?

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

Documentation

[wsycqyz]

Do we need this PR in 2024 or 2023 branch?

[wsycqyz]

PR test re-triggered.

[lizhijianrd]

Do we need this PR in 2024 or 2023 branch?

No, we only use master branch for fanout switch deployment.