Filter include_subdir from cpplint

[gbenziv]

xxxx

The project structure is intentionally designed to put the include and source files together in the same directory

Pull Request Checklist

• [x] I have ensured that my commit message contains the Issue ID.
• [x] I have ensured that my commit message contains the feature/bugfix description.
• [x] I have updated the documentation accordingly.
• [x] I have ensured my code follows the coding guidelines.
• [x] I have ran lint in my code locally prior to submission.
• [x] I have built my changes in local successfully.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #246 (293427c) into master (83cbce2) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 293427c differs from pull request most recent head 8168b5d. Consider uploading reports for the commit 8168b5d to get more accurate results

@@           Coverage Diff           @@
##           master     #246   +/-   ##
=======================================
  Coverage   95.47%   95.47%           
=======================================
  Files          65       65           
  Lines        1303     1303           
=======================================
  Hits         1244     1244           
  Misses         59       59           

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