master: CoreDNS prometheus metric annotations exposed at pod level

[kfr2]

These annotations would previously never be rendered because they
were added under the kube-dns section (rather than CoreDNS's).
Additionally, the annotations are now added to the Pods themselves
rather than the Deployment.

Fixes #1768

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[kfr2]

I signed it

[codecov-io]

Codecov Report

Merging #1769 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1769   +/-   ##
=======================================
  Coverage   24.76%   24.76%           
=======================================
  Files          98       98           
  Lines        5023     5023           
=======================================
  Hits         1244     1244           
  Misses       3640     3640           
  Partials      139      139

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[dominicgunn]

/lgtm