Merge pull request #56599 from xiangpengzhao/kubeadm_stable_v19_version
Automatic merge from submit-queue (batch tested with PRs 56599, 56824, 56918, 56967, 56959). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
kubeadm: Use the v1.9 branch by default
**What this PR does / why we need it**:
As per https://github.com/kubernetes/kubeadm/blob/master/docs/release-cycle.md, bump the default Kubernetes version to use in kubeadm right before v1.9.0-rc.1 (or maybe rc.0 ?) is cut.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
ref: https://github.com/kubernetes/kubernetes/pull/47440 https://github.com/kubernetes/kubernetes/pull/52085
**Special notes for your reviewer**:
/cc @luxas @kubernetes/sig-cluster-lifecycle-pr-reviews @kubernetes/kubernetes-release-managers
**Release note**:
```release-note
NONE
```
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