Fix for augeasproviders_pam

augeas.rb

  def in_position?
    unless resource[:position].nil?
      path, before = self.class.position_path(resource[:position], resource[:type])

      mpath = "#{resource_path}[preceding-sibling::#{path}]"

      augopen do |aug|
        augmatch = aug.match(mpath).empty?
        augmatch = before == 'before' ? augmatch : !augmatch
      end
    end
  end