message: Enable buildifier linter
  Test Plan: Tested locally
  Reviewers: #tensorflow, davidn
  Subscribers: davidn
diff: "(^tensorflow/contrib/ipu/.*\\.py$)",
  "(^tensorflow/python/ops/poplar/.*\\.py$)"
  ]
  + },
  + "buildifier": {
  + "type": "script-and-regex",
  + "include": [
  + "(^tensorflow/compiler/plugin/poplar/.*BUILD$)",
  + "(^tensorflow/python/ipu/.*BUILD$)",
  + "(^third_party/ipus/.*)"
  + ],
  + "exclude": [
  + "(^third_party/ipus/poplar_lib/LICENSE)"
  + ],
  + "script-and-regex.script": "sh -c '{ ./.linters/buildifier -lint warn -mode check $0 2>&1 ; ./.linters/buildifier -mode fix -lint fix $0;} || true'",
  + "script-and-regex.regex": "/^(?P<file>[^ :]*)(( # )|(:(?P<line>[^:]+): ))(?P<name>[^:]+)(: (?P<message>.*))?$/m"
  }
  +
  }
  }
  