def grouped_value=(avps)
      new_content = ''
      avps.each { |a| new_content += a.to_wire }
      @content = new_content
    end
def grouped_value=(avps)
      new_content = ''
      avps.each { |a| new_content += a.to_wire }
      @content = new_content
    end
Sets this AVP's byte data to a
 {http://tools.ietf.org/html/rfc6733#section-4.4 Grouped AVP}.

 @param [Array<AVP>] avps The AVPs that should be contained within
   this AVP.
 @return [void]