'Keep a store of previous fragments in an OrderedDict named pkt_frag_loads'

def frag_joiner(self, ack, src_ip_port, load):

    for ip_port in pkt_frag_loads:
        if (src_ip_port == ip_port):
            if (ack in pkt_frag_loads[src_ip_port]):
                old_load = pkt_frag_loads[src_ip_port][ack]
                concat_load = (old_load + load)
                return OrderedDict([(ack, concat_load)])
    return OrderedDict([(ack, load)])
