operations-dns-lint is now voting

The dns linter is now working :-]  Faidon created a DNS linting puppet
class with https://gerrit.wikimedia.org/r/#/c/82264

The Jenkins job got updated with
https://gerrit.wikimedia.org/r/#/c/82372/

Change-Id: I2d418cee9f1d97b8d470de4af2bb6e224525d840