Revert "Update default resolvers"
Revert "Update default resolvers"

This reverts commit 15f15ccf7d8002bd61e58667d8077d143f51b301.

This was updated to fix an issue which I thought was related to Google
rate-limiting, but was related to something else (ref: https://github.com/alphagov/govuk-dns/commit/c20421ef510344a775cd8d041b6c64cf933263f5).

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet