TODO

* Options should be available in list or directly in string form
* Server_identifier is not correctly set for selecting state
* Write test scripts
* Better exception handling
* Docs
* Package for various systems
* Add directory type for dhcp_file_io (multiple file IO support)
* Change interface to linux_interface and search for *BSD management
* Add a packet.SetTextOption for textual data handling
* Handle Maximum DHCP Message Size (option 57)
* Handle Overload (option 52)
* using recvmsg + IP_PKTINFO/cmsg to figure the interface of the UDP packet

OK * Use recvfrom instead of recv to store source IP of the received packet.
OK * Do simple SetParameter in dhcp_packet class to read human readable data (look at anemon server code)
OK * Finish import class