Block a user
env: export REGIONS and ZONE{zoneID}_REGION
env: export REGIONS and ZONE{zoneID}_REGION
cluster: introduce RegionIterator, Zone.ForEachRegion and decouple getRegion from finishRegion
rebased
cluster: introduce Region.Cluser and m/{region}/k8s_token to store a cluster's token
it's marked as cluster but without token (yet)
my intention was to generate the token when installing the first member of such cluster