chore: use numeric address to avoid DNS reverse lookup

[haitch]

Reason for Change:

• avoid DNS reverse lookup when starting kubelet
  • in some case custom dns server used in vNet, quality of their DNS is not guaranteed, which could block kubelet service start.

I did compare impact of this change, only different is it displays 0.0.0.0/0 instead of anywhere, for a clean aks cluster.

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

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[mboersma]

/azp run pr-e2e

[mboersma]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mboersma]

@haitch thanks!

It failed the generated files check, so you need to run make generate and commit the results to this PR.

[mboersma]

/ok-to-test

[haitch]

/azp run pr-e2e

[azure-pipelines]

Commenter does not have sufficient privileges for PR 1769 in repo Azure/aks-engine

[mboersma]

/azp run pr-e2e

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mboersma]

lgtm

[jackfrancis]

@yangl900 should sign off on this

[yangl900]

/LGTM

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: haitch, mboersma, yangl900

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