azure: detect VMs needing update from latestModelApplied

[hakman]

/cc @rifelpet @ameukam

[kubernetes-prow]

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[hakman]

/test pull-kops-azure-upgrade-dns-none

[kubernetes-prow]

@hakman: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-azure-upgrade-dns-none	657db06	link	false	/test pull-kops-azure-upgrade-dns-none

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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