Update coredns to 1.6.7

[maruina]

This PR updates CoreDNS to 1.6.7 where they restore metrics on cache miss for the cache pluging as per coredns/coredns#3578

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Hi @maruina. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[gjtempleton]

/ok-to-test

[maruina]

/retest

[maruina]

/assign @joshbranham

[gjtempleton]

/lgtm

Chased down the one note in the release notes which worried me:

coredns/coredns#3554

The relevant DNS fields have been marked deprecated since Dec 2016: kubernetes/dns#335 (comment)

I've also raised this regression on the existing PR upstream in k/k to update to 1.6.6 as a heads up.

[rifelpet]

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: maruina, rifelpet

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[hakman]

/retest

[rajansandeep]

This should not have been merged, as the image for 1.6.7 isn't available on gcr.io repo.