Add support for epp templates

[patemery]

Add the capability to use epp templates in hiera data to create sudoers.d files. There are two solutions for this. If the epp template is a simple template, then it can simply be used with the template meta-parameter without any other changes as in the following example.

sudo::configs:
    'os_admins':
        'template': "mytemplates/osadmins.epp"
    'dba_admins':
        'template': "mytemplates/dbaadmins.erb"

If the epp template is more complex and requires input parameters, there is a new meta-parameter template_epp. This meta-parameter requires two input parameters; filename (string) and params (hash). There are examples of this given in the README.

Additionally, I've added two new epp templates that allow for some more elaborate sudoers.d allocations.

[saz]

@patemery Please rebase this MR, fix issues and squash commits

[patemery]

Wow. I don't have a lot of git experience. It took me about 3 hours to get this all cleaned up. I think I have it the way you wanted it. Thank you so much for considering my enhancement. Let me know if I am still missing anything

[saz]

@patemery I've just merged a PR, which adds data types to all parameters in sudo::conf. It would be great to rebase your branch against the master branch of this module

[patemery]

@saz I merged all of your latest commits and tried your latest type suggestion. It worked great. Thank you for that. I would have never come up with that.

I looked at the existing tests. I'm sad to admit I've never written any rspec tests. I think I can create a few following the existing code as examples. Can you tell me how to execute the tests on my local system? I downloaded and installed pdk and I tried doing pdk test unit and got the error This module is not PDK compatible.