feat: Support additional cluster DNS IPs with Bottlerocket based AMIs

[ramseymcgrathfd]

Description

Adding support for providing multiple cluster ips into the bottlerocket template.
This resolves #3050

Motivation and Context

Utilities like node local dns may require multiple cluster-dns-ip values to run properly on bottlerocket. Support in bottle rocket has been available since 1.18 https://github.com/bottlerocket-os/bottlerocket/releases/tag/v1.8.0

Breaking Changes

No

How Has This Been Tested?

• [ x] I have updated at least one of the examples/* to demonstrate and validate my change(s)
• [ x] I have tested and validated these changes using one or more of the provided examples/* projects
• [ x] I have executed pre-commit run -a on my pull request
• This has been replicated on existing community-based module in-house

[bryantbiggs]

I don't know that we will be accepting this change:

1. The EKS CoreDNS addon now supports autoscaling so is node local DNS still needed?
2. I believe you can already pass this value yourself through user data which means we don't have to bake this weird/funky logic into the module:

  bootstrap_extra_args = <<-EOT
      [settings.kubernetes]
      "cluster-dns-ip" = ["172.21.0.10", "169.254.20.10"]
   EOT

[bryantbiggs]

eh, scratch that. we set the IP here in this module. one sec

[ramseymcgrathfd]

eh, scratch that. we set the IP here in this module. one sec

yeah its hard-coded to a single ip. Pulling that out completely would also work, users can generate it themselves as an extra arg for the template.
I don't think its a good idea to just assume no one will ever need node-local

[ramseymcgrathfd]

Sorry, closed by accident

[ramseymcgrathfd]

👍 👍

[antonbabenko]

This PR is included in version 20.12.0 🎉

[github-actions]

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