Enable no-unused-vars
Enable no-unused-vars

Disallow Unused Variables (no-unused-vars)

Variables that are declared and not used anywhere in the code are
most likely an error due to incomplete refactoring. Such variables
take up space in the code and can lead to confusion by readers.

http://eslint.org/docs/rules/no-unused-vars

Change-Id: I92e35b8aadddf9119eebbed810e917f9f5980434

openstack/eslint-config-openstack