aws+gce+cinder storageclass, change zone texts if not specified #3693
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update aws+gce availability texts, the algorithm is not random
Doc change for kubernetes/kubernetes#44798
AWS + gce texts changed also because it is not really "random zone"
https://github.com/kubernetes/kubernetes/blob/master/pkg/volume/util.go#L295 "Volumes are generally round-robin-ed across all active zones"
This change is