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Stop using the PersistentVolumeLabel admission controller in v1.9
**What this PR does / why we need it**:
Stop using the PersistentVolumeLabel admission controller in v1.9, as in v1.9, we're targeting out-of-tree cloud providers to be ready to use more generally as part of moving to beta.
**Which issue this PR fixes**:
fixeskubernetes/kubeadm#444
210626577b