Added Hackfest 5 material

hackfest5/.gitignore

hackfest5/README.md

hackfest5/clab-cli-dc1.sh

hackfest5/clab-cli-dc2.sh

hackfest5/clab-cli-r1.sh

hackfest5/clab-cli-r2.sh

hackfest5/clab-deploy.sh

hackfest5/clab-destroy.sh

hackfest5/clab-graph.sh

hackfest5/clab-inspect.sh

hackfest5/clab/hackfest5.clab.yml

hackfest5/data/ietf-l3vpn-service.json

hackfest5/data/tfs-service.json

hackfest5/data/tfs-topology.json

hackfest5/deploy_specs.sh

hackfest5/images/arista/.gitignore

hackfest5/images/arista/.gitkeep

hackfest5/redeploy-tfs.sh