collectives parameter should be an array

[igalic]

currently collectives is a "Comma seperated list of collectives".

This makes it hard to override the parameter hierarchically.
We should change it to an array, while keeping the string for backwards compatibility.

[jyaworski]

So it looks like this was done a while ago. It's in the changelog:

https://github.com/voxpupuli/puppet-mcollective/blob/master/CHANGELOG.md#2014-09-03-release-200

Is this not the case?