Do not parse header logs in PyFlakes and PyLint steps

[djmitche]

Fixes #3337.

[tardyp]

👍

[tardyp]

lint issue

[djmitche]

lint should be fixed..

[codecov-io]

Current coverage is 84.55%

Merging #1846 into master will not affect coverage as of 2009566

@@            master   #1846   diff @@
======================================
  Files          320     320       
  Stmts        31108   31112     +4
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit          26302   26306     +4
  Partial          0       0       
  Missed        4806    4806       

Review entire Coverage Diff as of 2009566

---

Uncovered Suggestions

1. +0.11% via ...ot/status/builder.py#381...414
2. +0.09% via ...ot/status/builder.py#453...481
3. +0.09% via ...dbot/changes/mail.py#478...505
4. See 7 more...

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