Lxc provider

Some services can run in lxc container.

This provader deploys lxc hosts with another provider and then deploys lxc containers

Sample configuraion:

            "provider": {
                "name": "LxcProvider",
                "containers_per_host": 4,
                "distribution": "ubuntu",
                "host_provider": {
                    "name": "SomeProvider",
                }
            }