Increase the robustness of the chef module

Add the following adjustments to the chef template and module

- Make it so that the chef directories can be provided (defaults
  to the existing directories)
- Make the params much more configurable, and if a parameter is
  provided in the chef configuration it will override existing template
  parameters.
- Make the template skip lines if the values are None in the configuration
  so that template lines can be removed if/when this is desirable.
- Allow the firstboot json path to be configurable (defaults to the
  existing location).
- Adds a basic set of tests to ensure that good things are happening.

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