Travis (.com) master branch:
KVM/Installation
https://help.ubuntu.com/community/KVM/Installation
Vagrant and Libvirt with KVM or QEMU
https://docs.cumulusnetworks.com/cumulus-vx/Development-Environments/Vagrant-and-Libvirt-with-KVM-or-QEMU/
Cumulus Linux Demo Framework
https://github.com/CumulusNetworks/cldemo-vagrant#what-is-cldemo-vagrant