The getAdoptMetadataJSONSecretName() function returns the wrong secret name, causing it to conflict with the admin kubeconfig secret name. https://github.com/openshift/hive/blob/master/pkg/clusterresource/builder.go#L691-L692 

When adopting a cluster with --adopt-metadata-json, two different secrets would have the same name:

• Admin kubeconfig secret: {clusterName}-adopted-admin-kubeconfig
• Metadata JSON secret: {clusterName}-adopted-admin-kubeconfig (should be {clusterName}-metadata-json)