Add CoreDNS details to DNS Debug docs#10201

Merged

k8s-ci-robot merged 2 commits intokubernetes:release-1.12from chrisohaver:corednsdebug

Sep 10, 2018

+105-11

Commits on Sep 5, 2018

add coredns details
chrisohaver
committed

Commits on Sep 7, 2018

address nits, add query logging section
chrisohaver
committed