WIP added deploy_helper module tests

I did not know if this was required, but it seemed prudent to add tests for the deplot_helper module.
The pull request for the module is on the ansible-modules-extra's repository: https://github.com/ansible/ansible-modules-extras/pull/110

I consider this a WIP. The tests all run down here, and they cover all the module features/parameters, but I'd still like to have a second opinion.