ng_netflow patch for AS filling

[Stas Timokhin]

		Hello !

  Patch for injecting information network->as_number from extrernal sources 
(RIPE database, for example) into kernel and filling src and dst AS-number in 
Netflow v5 datagrams.

http://www.stasyan.com/devel/ng_netflow/patch_ngnetflow_asnum.txt

Example of converted RIPE-database for it:
http://www.stasyan.com/devel/ng_netflow/ripe_201303.ng

This patch made for FreeBSD 10.x-current for state at 26.02.2013.