Update CoreDNS to v1.7.0 - Take 2

[rifelpet]

I cherry-picked the commits from #9508 into a new branch to see if this helps with the github action verify failure. I can't reproduce the test failure locally so we should figure out why its happening before merging.

We'll see if this one fails as well.

[k8s-ci-robot]

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[hakman]

Looks like it's ok.

[rifelpet]

In the Run actions/checkout@v2 step of the failing job: https://github.com/kubernetes/kops/pull/9508/checks I see it references a merge commit that isn't in the PR, so maybe that's related?

Checking out the ref
/usr/bin/git log -1
commit 5e3a5709c21f906510e2fc673a96c46d5843a6f3
Author: Sandeep Rajan <[email protected]>
Date:   Wed Jul 8 19:56:51 2020 +0200

    Merge 084f586bf1b3589f7a516303df269ea24a9a6cc9 into 98ed5d4fa1a1cd1e2645c26dfd0f443b3aa2375c

Regardless, i think this PR is safe to merge. Thanks @rajansandeep !

[hakman]

/lgtm
/retest