Copy kubernetes.io/hostname label to PVs

[cofyc]

What problem does this PR solve?

To simplify administration, it would be helpful to be able to search PVs by node name.

e.g.

$ kubectl get pv -l kubernetes.io/hostname=kube-node-3
NAME                CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM   STORAGECLASS    REASON   AGE
local-pv-d20c2706   6Gi        RWO            Delete           Available           local-storage            5m4s

What is changed and how it works?

Configure kubernetes.io/hostname in nodeLabelsForPV, local-volume-provisioner will copy node labels to PVs it provisioned.

Note that local-volume-provisioner does not sync labels between node and PVs. It only applies to new PVs for now.

Check List

Tests

• Unit test
• E2E test
• Stability test
• Manual test (add detailed scripts or steps below)

1, Update local-volume-provisioner

kubectl apply -f manifests/local-dind/local-volume-provisioner.yaml
kubectl -n kube-system delete pods -lapp=local-volume-provisioner

2, Check new PVs it provisions

• No code

Code changes

• Has Helm charts change
• Has Go code change
• Has CI related scripts change
• Has documents change

Side effects

• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

[weekface]

/run-e2e-tests

[tennix]

LGTM