Migrate to module level hiera data.

[traylenator]

Affected Puppet, Ruby, OS and module versions/distributions

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

Following on from #920 migrate the collectd
module to module level hiera data.

In particular we can set OS based defaults such as

collectd:plugin::write_http::mange_plugin: false

for debian, centos7 and true for centos8.

Currently in this plugin and others there is a lot of OS based logic in the manifest code
which should ideally not be there - hard to maintain moving forwards to new OSes.