Use vm.Reboot() instead of rebooting manually (#1358)
Use vm.Reboot() instead of rebooting manually (#1358)


GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker