I forgot to describe what happend in last commit. According to issue #3, there wasn't possible to live migrate due to nova's shared directory (`/var/lib/nova/instances`, commit 3e34e25545c7f73d8d8fb82599aed9e63d105ff0), which show broken ownership. Fixed with group and user creation previous to packages' installation.
The next step: offer PaaS using Docker. But it's too early to deploy files - we're still in test stage...