File _servicedata of Package firecracker

<servicedata>
<service name="tar_scm">
                <param name="url">https://github.com/firecracker-microvm/firecracker.git</param>
              <param name="changesrevision">7db02adc28eaeb5f54a0d4a8c312e7e9954070b6</param></service></servicedata>