Fix type of --beam_it_timeout flag (was string, needs to be integer)
Fix type of --beam_it_timeout flag (was string, needs to be integer)

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