[action] [PR:8586] Defined new T2 Scaled Topology (5LC, 96 Neighbors)

[mssonicbld]

Summary:

1. new T2 Topology with 5 Linecards (96 Neighbors),

Type of change

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

Back port request

• 201911
• 202012
• 202205

Approach

What is the motivation for this PR?

Needed a new t2 topology to stress out T2 chassis.

How did you do it?

Defined a new T2 topology which uses 5 Linecards.
Total Number of T3 Nbrs: 16
Total No of T1 Nbrs: 80
1 Linecards dut0 connected to Uplink(T3 VMs)
4 Linecards dut1 - dut4 are connected to downlink (T1 VMs)

The new topology has mixture of 4 port Lags/2 Port Lags/1 Port lag for T3 Neighbors. It also has mixture of 2Port lag/1port Lag/single port link for t1 Nbrs.

How did you verify/test it?

1. Verified that server is stable with this topo config.
2. On Dut: verified that all BGP sessions come up and routes are learnt.
   

[mssonicbld]

Original PR: #8586