def drop_root(self):
        if self.sudo_proxy is not None:
            self.sudo_proxy.close()
            if self.keep_sudo_proxy_alive:
                self._old_sudo_proxies.append(self.sudo_proxy)
            else:
                self.sudo_proxy.terminate()
            self.sudo_proxy = None
verify that a persistent job can be killed using `jut jobs kill`
dataset/ETHPy150Open cloudmatrix/esky/esky/__init__.py/Esky.drop_root--crossover with--dataset/ETHPy150Open jut-io/jut-python-tools/tests/jut_jobs_tests.py/JutJobsTests.test_jut_kill_on_persistent_job