ARROW-2035: [C++] Update vendored cpplint.py to a Py3-compatible one

cpp/CMakeLists.txt

@@ -447,7 +447,7 @@ if (UNIX)
   add_custom_target(lint ${CPPLINT_BIN}
   --verbose=2
   --linelength=90
-  --filter=-whitespace/comments,-readability/todo,-build/header_guard,-build/c++11,-runtime/references,-build/include_order
+  --filter=-whitespace/comments,-readability/todo,-build/header_guard,-build/c++11,-runtime/references,-build/include_order,-build/include_what_you_use
   ${FILTERED_LINT_FILES})
 endif (UNIX)
 

cpp/README.md

@@ -267,9 +267,6 @@ These commands require `clang-format-4.0` (and not any other version).
 You may find the required packages at http://releases.llvm.org/download.html
 or use the Debian/Ubuntu APT repositories on https://apt.llvm.org/.
 
-Also, if under a Python 3 environment, you need to install a compatible
-version of `cpplint` using `pip install cpplint`.
-
 ## Continuous Integration
 
 Pull requests are run through travis-ci for continuous integration.  You can avoid