new object type: network security

• http://www.foundrynet.com/products/security/si-traffic-mgrs.html
• http://www.foundrynet.com/products/security/si-lan-switches.html

• http://www.dlink.com/products/?sec=0&pid=454
• http://www.dlink.com/products/?sec=0&pid=328
• http://www.dlink.com/products/?sec=0&pid=455

• http://www.extremenetworks.com/products/sentriant-all.aspx
• http://www.force10networks.com/products/pseries.asp

http://www.juniper.net/products_and_services/firewall_slash_ipsec_vpn/index.html

http://www.cisco.com/en/US/products/ps6120/prod_models_comparison.html

Done in r2288.