Re-design lab network to spine and leaf

[Zxanthar98]

[Zxanthar98]

• Create a simple spine and leaf topology that uses OSPF in the underlay, and BGP as an overlay. This will give the new tool I'm testing, Pyats a good amount of data to collect and leverage.

[Zxanthar98]

I need to add the GRE tunnels between the leaf switches to enable some interesting overlay for PyATS and Genie to profile.