Fixed a recent break in Cloud Redis resource initialization. (#1581)
Fixed a recent break in Cloud Redis resource initialization. (#1581)

REVID=187532484
GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker