Remove rubocop plugin use from codeclimate
Remove rubocop plugin use from codeclimate

Until some codeclimate-rubocop issues are resolved
I am removing codeclimates rubocop plugin.

[rubocop-perfromance](https://github.com/codeclimate/codeclimate-rubocop/issues/187)

In any event we are running rubocop as part
of the test suite CI run.

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