windydayc

refactor yurtadm init/join and support to create high-availability OpenYurt cluster

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#### What type of PR is this? /kind feature /kind enhancement #### What this PR does / why we need it: At present, the installation of OpenYurt cluster is still...

[feature request] The k8s version problem involved in `yurtadm join`

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When using `yurtadm join` , the kubeadm, kubelet will be downloaded from [here](https://github.com/openyurtio/openyurt/blob/9ee902ccdbe884a56a486fe3c1f457c3dabb19dd/pkg/yurtadm/util/kubernetes/util.go#L126-L127), and their versions will be the same as the installed kubernetes version. However, in [preflight phase](https://github.com/openyurtio/openyurt/blob/2fdfb0660d1227f0f5b3a21dec3aa721c3bde7cd/pkg/yurtadm/cmd/join/phases/preflight.go#L80-L81), it...

[Proposal] add yurtadm proposal

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#### What type of PR is this? /kind feature /kind design #### What this PR does / why we need it: Related issue #856 #### Special notes for your reviewer:...

failed to render build args: failed to process... unexpected end of statement while looking for matching single-quote

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#### What happened: ``` [root@host8c context]# sealer run testpatch:latest -m 10.10.102.155 -p xxx 2022-06-17 11:30:15 [INFO] [local.go:288] Start to create a new cluster: master [10.10.102.155], worker [] 2022-06-17 11:30:20 [INFO]...

Cannot get $HOSTNAME in CMD of Kubefile

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#### What happened: $HOSTNAME in CMD of Kubefile is not available. ``` [root@host8c files]# sealer apply -f Clusterfile-testhostname //... 2022-06-16 18:37:48 [INFO] [init.go:251] start to init master0... 2022-06-16 18:38:55 [INFO]...