Package rollback

The XML API OSS interface uses the rollback package to manage the Configuration Rollback feature provided on 7x50 SR network elements. Configuration Rollback provides the ability to "undo" configuration and move back to previous router configuration states while minimizing impacts to services (i.e. no reboot). A history of changes is preserved allowing rollback to different checkpoints. The operator can define and save a special rescue configuration that is separate from the rolling log of checkpoint files.