Replace k0s.service.j2 template with adoption of new k0s install sub command about k0s-ansible HOT 2 CLOSED

Let's do this. This will be great because we'll have the system unit file from k0s as a single source of truth. From what I see in the code of the k0s install command, it also works with workers. We can pass a path to a token file as an argument.

Update: Creating systemd services for worker nodes is not yet implemented in the install command but is sure to come. We can implement it once the install command has matured a bit more.

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@usrbinkat The k0s install command now supports adding workers. I've updated the playbook to use the command to create services for controller and worker nodes. Feel free to look over it. I willl create a release ones the final version of k0s-v0.10.0 is available 😃

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