Flake8: Run as part of tests

scripts/run-tests.sh

@@ -4,4 +4,5 @@ export TELEMETRY_USER_ID=502
 python3 -m venv /tmp/tests
 /tmp/tests/bin/pip install -r /app/dev-requirements.txt
 /tmp/tests/bin/pip install /app
+/tmp/tests/bin/flake8 pollbot tests
 /tmp/tests/bin/py.test /app/tests