support systemd kubelet to start the cluster automatically

[fujitatomoya]

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Overview

currently this doc does not include how to set up the systemd service to start the cluster automatically. this would be really useful for development and trials because setting up cluster is required every single time the cluster nodes are shut down.

Requirement

• static master only. (backup control-plane, dynamic master discovery is not in this scope.) user can specify the master control-plane ip address and that should be also set for each worker node, and the systemd service will set ups the cluster system once they are online.
• this should be able to work after rebooting the any nodes.
• provide token generation and setting procedure for the cluster.
• scripts or systemd service file to start the systemd service to set up the cluster. (required for master and worker nodes.)
• add documentation how to install and uninstall the systemd service files,including enabling and disabling.

[fujitatomoya]

reference, https://joepreludian.medium.com/how-to-start-up-minikube-automatically-via-system-d-2cad99fd79bf