Pylint: Disable 'duplicate-code' warning

Pylint's 'duplicate-code' warning cannot be disabled on a
per-snippet/file basis and therefore needs to be disabled globally to
cope with valid usages of multiple similar lines.

Upstream issue: https://github.com/PyCQA/pylint/issues/214

Change-Id: I0693406c0a48fb7029b6ca18cc01852839a48cbc