Add Puppet module collectd

The module is necessary to integrate collectd support in Packstack.

The module is available at
https://github.com/pdxcat/puppet-module-collectd.

This module update commit was generated by Bade.
For more info please check https://github.com/paramite/bade

This commit is setting modules to following state:
module-collectd
 - initial commit: cf79540be4623eb9da287f6d579ec4a4f4ddc39b