def rollback(self, context, reservations, project_id=None, user_id=None):
        pass
Process the single task, ping GAE app, and delete task from queue.
dataset/ETHPy150Open openstack/nova/nova/quota.py/NoopQuotaDriver.rollback--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/solutions-orchestrator-android-sampleapp-smashpix/daemon/compute_engine_daemon.py/TaskThread.run