[BEAM-3444] Fix python3 flake8 errors e999#4376

Merged

aaltay merged 3 commits intoapache:masterfrom

holdenk:BEAM-3444-fix-flake8-errors-e999

Feb 27, 2018

Commits on Feb 23, 2018

First pass at fixing all of E999 (invalid parsing) errors in Py3 found by flake8
holdenk
committed

Commits on Feb 24, 2018

Fix some raise_from to reraise.
holdenk
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vcfio somehow has some sort issues. It's not overly important and hopefully we can remove isort after the py3 migration is complete and just depend on pylint.
holdenk
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