message: Apply whitespace checks to .proto files
  Description: makes sure proto files don't have overenthusiastic spaces
  Risk Level: n/a
  Testing: manually added whitespace.
  Docs Changes: n/a
  Release Notes: n/a
diff: @@ -13,8 +13,8 @@ import traceback
  EXCLUDED_PREFIXES = ("./generated/", "./thirdparty/", "./build", "./.git/",
  "./bazel-", "./bazel/external", "./.cache")
  -SUFFIXES = (".cc", ".h", "BUILD", ".md", ".rst")
  -DOCS_SUFFIX = (".md", ".rst")
  +SUFFIXES = (".cc", ".h", "BUILD", ".md", ".rst", ".proto")
  +DOCS_SUFFIX = (".md", ".rst", ".proto")
  # Files in these paths can make reference to protobuf stuff directly
  GOOGLE_PROTOBUF_WHITELIST = ('ci/prebuilt', 'source/common/protobuf', 'api/test')
  