Virt-Lightning 2.2.0

Release 2.2.0 of Virt-Lightning, a lightweight CLI for libvirt which can serve as an alternative to Vagrant. It's also a stable API that you can use in Python to quickly spawn new VM, like you would do with a Cloud provider.

Most of the new features come from contributors and I'm pretty happy with this.

Changelog

• Cosmetic documentation changes
• Don't try to fetch an image that already exists
• Add ability to boot old system with no virtio support
• Use Libvirt default settings when possible
• Use the VNC display by default
• Add support for OpenVSwitch (a.k.a OVS )bridge
• vl stop: avoid a Python backtrace if the VM doesn't exist