Automatic merge from submit-queue

kubeadm: Remove the kubernetes.io/cluster-service label from the Deployment templates

**What this PR does / why we need it**:

As discussed on Slack, these labels have no function when not using the addon-manager, so it's best to remove them to avoid confusion.

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```
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