Implement filebeat modules

[TuningYourCode]

Hi,

this PR implements the possibility to manage some of the filebeat modules to be configured with this puppet module. The module currently only supports modules by giving the whole array to filebeat::modules. It also requires people to know the exact structure that it works.

The new filebeat::module::* classes will abstract the structure and also perform correct datatype for each parameter. Beside this it also enables to setup modules based on the really installed services on a host if you define the filebeat::module::* in your profile / role files.

e.g. we now can do in our profile::redis take care of the redis configuration and also include filebeat::module::redis without having to somehow pass it to the filebeat::modules: array.

So far i only implemented modules used by us but implementation of the other filebeat modules would be possible and also custom modules will be possible if the module files (pipeline, dashboard etc.) are copied to the correct directory.

Best regards,
Stephan

[TuningYourCode]

Build failure is related to gem retrieval - most likely affects all builds currently. I guess module needs to update for latest pdk version.