Add acceptance test and documentation for file autorequire

[bastelfreak]

In #106 I wanted to
implement an autorequire for file resources. I noticed that the type
already has code to autorequire stuff:

puppet-posix_acl/lib/puppet/type/posix_acl.rb

Lines 95 to 103 in 3f267b2

	if autorequire_type != :posix_acl
	if self[:recursive] == :true
	catalog.resources.select do |r|
	r.is_a?(Puppet::Type.type(autorequire_type)) && self.class.descendant?(self[:path], r[:path])
	end.each do |found| # rubocop:disable Style/MultilineBlockChain
	req << found[:path]
	end
	end
	req << self[:path]

Pull Request (PR) description

This Pull Request (PR) fixes the following issues

[bastelfreak]

Given that the tests pass. I think we can close #106