allinone: add join subcommand to join the existing k8s

[llhuii]

This aims to the simulation of multi edge virutal nodes on a single node,
and join the existing Kubernetes cluster, also supports the cluster
created by this allinone script.

Signed-off-by: llhuii liulinghui@huawei.com

[kubeedge-bot]

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[llhuii]

A temporary katacoda course for this: https://www.katacoda.com/sedna-ai/scenarios/all-in-one-2

[kubeedge-bot]

@llhuii: PR needs rebase.

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