Location of puppet::defaults::facterbasepath is incoherent under puppet 4

[Falkor]

The default settings for the $facterbasepath is set to /opt/puppetlabs/facter under puppet 4.x, however all the over configs such as $confdir or $codedir are (rightly) placed under /etc/puppetlabs/* (and not /opt/puppetlabs/*).

It would be great thus to change this settings -- see Pull request #147

[rendhalver]

This will break the API of this module.
They may be wrong but this module is setting things up in a particular way and changing that will break peoples setups and I am not wiling to do that without good reason.

If we do something like this I believe it will need a major version increment.