More details about the topology in the img/png file

3 line card topology with all ports connected to VM

Adding T2 topology file for a SONiC Chassis that has 4 DUT's:
  - 3 linecards - dut_index 0, 1, and 2
  - 1 supervisor card - dut_index 3

Each linecard has 32 VM's.

BGP info:
   DUT ASN: 65100
  Linecard 1 (dut_index 0) has 32 eBGP peers, each with the same ASN 65200
  Linecard 2 (dut_index 1) has 32 eBGP peers, each with a different ASN (65001-65132)
  Linecard 3 (dut_index 2) has 32 eBGP peers, each with a different ASN (65033-65064)

Adding a T2 topology file

Incorporated comments by Ying and added lag+regular ports on each DUT

T2 topology now has LAGs and regular ports. hence # of VMs reduce

…work with gen-mg

- Changed addresses from 20.0.0.x on interfaces to 10.0.0.x to be inline with other topologies
- Added loopback interfaces for the line card DUTs
- Added dut_index to ports on the VMs.
- changed vm_offset to not jump by 2 for the LAG VMs - increment it only by 1.