refactor helper from class to module

[johrstrom]

This helper class is used in basically every adapter.
https://github.com/OSC/ood_core/blob/master/lib/ood_core/job/adapters/helper.rb

Instead of having a class that you reference, instead we should just have it as a module that is included in the Adapter parent class so that all adapters just have these helper methods available and don't have to go about referencing the static OodCore::Job::Adapters::Helper class.

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