Fix webapp pylint errors

[williexu]

Webapp

Run ./scripts/ci/test_static.sh on the pylint branch
Pylint violations: https://travis-ci.org/Azure/azure-cli-extensions/jobs/377034480

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[williexu]

@panchagnula when can this be done? All extensions have been cleaned of pylint errors aside from webapp.
Changes shouldn't take long and the sooner pylint can be run on new PRs, the better.

[panchagnula]

@williexu , can you give me instructions here to identify the fixes? i did a few updates on Sunday, however, since the Travis CI didn't fail i wasn't sure what all needed to be updates. Thanks!

[williexu]

@panchagnula yep, I've synced the pylint branch with master: https://github.com/Azure/azure-cli-extensions/commits/pylint

The CI for that branch is currently failing atm: https://travis-ci.org/Azure/azure-cli-extensions/builds/377068460?utm_source=github_status&utm_medium=notification (you can reach this page by clicking the red X next to the latest commit)
You can also identify the fixes needed by running ./scripts/ci/test_static.sh on your machine after checking out the pylint branch.

Please make a PR against that branch after addressing the violations.

Hope this helps, also feel free to DM me with any other questions.

[williexu]

Addressed with #175