sync

Hi,

I started to sync with the 1.1.3 and port adidtional builders.

ng-050121
- new builders:
    - libnet_build_tlv_[uint32, str](): type and length are 1 byte
      long
    - libnet_build_cdp_tlv_[uint32, str](): type and length are 2
      bytes long
- sync with 1.1.3
    - import libnet_version() in libnet_common.c
    - fixed a bug ln libnet_name2addr4 in which it didnt call
      hstrerror
    - fixed the cdp.c sample code (mostly rewrote it with the cdp_tlv
      builders)
- port builders
    802_1q, ntp, cdp (mostly rewritten)
    Warning:
      CDP: csum not controlled in tcpdump/ethereal :(((

As usual:

http://www.security-labs.org/libnetng/

Cheers,

	Fred Raynal