Allow multiple hostnames in internal annotation for pods

[Pluggi]

Description

This PR allows multiple record names separated by commas in the internal-hostname annotation of pods, as is available for services.

Checklist

• Unit tests updated
• End user documentation updated

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Pluggi / name: Pluggi (f385139)

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[johngmyers]

dns-controller does indeed support that syntax. Thanks for doing this.

/lgtm
/assign seanmalloy

[szuecs]

/ok-to-test

[szuecs]

Please fix:

golangci-lint run --timeout=15m ./...
level=warning msg="[linters_context] rowserrcheck is disabled because of generics. You can track the evolution of the generics support by following the https://github.com/golangci/golangci-lint/issues/2649."
source/pod.go:96: unnecessary trailing newline (whitespace)

			}
make: *** [Makefile:51: go-lint] Error 1
Error: Process completed with exit code 2.

[Pluggi]

It's all green now :)

[johngmyers]

/lgtm

[szuecs]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Pluggi, szuecs

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