add support/example for nomad plugins

[attachmentgenie]

Affected Puppet, Ruby, OS and module versions/distributions

• Puppet:
• Ruby:
• Distribution:
• Module version:

How to reproduce (e.g Puppet code you use)

What are you seeing

What behaviour did you expect instead

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Any additional information you'd like to impart

[maxadamo]

this issue is incomplete, and not very clear. What kind of support is needed for the plugins?
Plugins can be configured as a code block in the config_hash.

Probably something like the following:

    ...
      plugin     => [
        docker   => {
          config => {
            allow_privileged => true
          }
        },
        raw_exec => {
          config => {
            enabled => true
          }
        }
      ],
    ...

[attachmentgenie]

so in my mind what we need is 2 fold,

1. some sort of defined type that can download/install the plugin
2. an example in the docs that basically show how to enable it in confog