message: linter
  Summary: Only lint plugin/poplar
  Reviewers: davidn, jamesn
diff: "linters": {
  "clang-format": {
  "type": "clang-format",
  - "include": "(\\.(c|cpp|C|cc|c\\+\\+|cxx|h|hpp)$)"
  + "include": "(^tensorflow/compiler/plugin/poplar/.*\\.(c|cpp|C|cc|c\\+\\+|cxx|h|hpp)$)"
  }
  }
  }
  