Add support for RBN-based node names

[olemarkus]

What type of PR is this?

Uncomment only one, leave it on its own line:

/kind feature

What this PR does / why we need it:

AWS recently launched support for instance DNS host names based on instance ID rather than ipv4.
This PR adds support for nodes with those DNS hostnames

Which issue(s) this PR fixes:

Fixes #285

Special notes for your reviewer:

Originally, node names were suffixed with the domain name. AWS CCM is to my knowledge the only CCM that do not use only the hostnames. As a consequence, all relevant k8s components need set --hostname-override as kubelet et.al cannot automatically determine the hostname. Because of this, with RBN, CCM expects only the hostname. The kubectl get nodes output then looks like this:

$ kubectl get nodes
NAME                  STATUS   ROLES                  AGE   VERSION
i-03a7726a034596f51   Ready    node                   81m   v1.21.3
i-0e0d7ce03d5827f91   Ready    control-plane,master   91m   v1.21.3

Does this PR introduce a user-facing change?:

Added support for instances with Resource Based Naming.

[johngmyers]

/lgtm

[johngmyers]

/kind feature
/assign @andrewsykim

[nckturner]

This looks good to me, as it should only affect RBN named instance, afaict.
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johngmyers, nckturner, olemarkus

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