Use default facter version from rspec-puppet-facts

Since rspec-puppet-facts 2.0.0 the default Facter version is derived
from the Puppet version. There is no more need to do this locally. It
also handles Puppet 7 which our code doesn't.

lib/voxpupuli/test/spec_helper.rb

@@ -1,20 +1,3 @@
-# getting the correct facter version is tricky. We use facterdb as a source to mock facts
-# see https://github.com/camptocamp/facterdb
-# people might provide a specific facter version. In that case we use it.
-# Otherwise we need to match the correct facter version to the used puppet version.
-# as of 2019-10-31, puppet 5 ships facter 3.11 and puppet 6 ships facter 3.14
-# https://puppet.com/docs/puppet/5.5/about_agent.html
-#
-# The environment variable `PUPPET_VERSION` is available in our travis environment, but we cannot rely on it
-# if somebody runs the tests locally. For that case we should fallback the the puppet gem version.
-def suggest_facter_version
-  return ENV['FACTERDB_FACTS_VERSION'] if ENV['FACTERDB_FACTS_VERSION']
-
-  require 'bundler'
-  puppet_version = ENV['PUPPET_VERSION'] ? ENV['PUPPET_VERSION'] : Gem.loaded_specs['puppet'].version.to_s
-  Gem::Dependency.new('', puppet_version).match?('', '5') ? '3.11.0' : '3.14.0'
-end
-
 RSpec.configure do |config|
   # puppetlabs_spec_helper defaults to mocha but emits a deprecation warning
   # Vox Pupuli prefers rspec to avoid the deprecation warning unless explicitly
@@ -28,9 +11,6 @@ def suggest_facter_version
 require 'puppetlabs_spec_helper/module_spec_helper'
 
 RSpec.configure do |config|
-  config.default_facter_version = suggest_facter_version
-
-  # Coverage generation
   config.after(:suite) do
     RSpec::Puppet::Coverage.report!
   end