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airship-libvirt-gate role is designed to build a fully functioning all-in-one type infrastructure for development, testing or gating purpose on top of libvirt + qemu. It has concept of `Flavor` which would allow users to pick fingerprint (size of the env). In this commit only flavor called `small` is introduced. In near future we will add other flavors. For default usecases please see examples/playbooks/gate directory. Change-Id: Ifefd299592b91ce2810794eb29050874977397f2