kjellander dd460e2aa2 Fix lint errors to enable stricter PyLint rules
These fixes are needed to avoid errors after submitting
https://codereview.webrtc.org/2737963003

BUG=webrtc:7303
NOTRY=True

Review-Url: https://codereview.webrtc.org/2812273002
Cr-Commit-Position: refs/heads/master@{#17679}
2017-04-12 19:06:13 +00:00
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