libdnet: add recipe

   *dumb networking library
   *snort depends libdnet

Signed-off-by: Chunrong Guo <B40290@freescale.com>
Signed-off-by: Joe MacDonald <joe@deserted.net>
barnyard2: add recipe

  *Barnyard2 is a output system for Snort

Signed-off-by: Chunrong Guo <B40290@freescale.com>
Signed-off-by: Joe MacDonald <joe@deserted.net>
snort: add recipe

  *snort - a free lightweight network intrusion detection
         system for UNIX and Windows

Signed-off-by: Chunrong Guo <B40290@freescale.com>
Signed-off-by: Joe MacDonald <joe@deserted.net>