Added puppet_provider option to settings.yml

Hi,

I added the option to set the puppet_provider to mcollective in settings.yml via foreman_proxy::puppetrun_provider. It default's to false, so nothing will happen until it is set to anything that evaluates to true.

No syntax check or anything, so not just "mcollective" is valid for this as a string. I'm not if we shall check valid values here...


Cheers,
Dennis