This patch add 3 extra packages for zabbix-agentd

This patch add 3 extra packages for zabbix-agentd

zabbix-extra-network: a detection rule with the ifname (eth0.1) and the network name (wan).
zabbix-extra-wifi: an universal detection rule for wifi (using libuci-lua) and many userparameters (using libiwinfo-lua)
zabbix-extra-mac80211: a phy (phy0) detection rule and userparameters for mac80211 devices

zabbix-extra-network and zabbix-extra-wifi will work as non root user if /etc/config/wireless and /etc/config/network are world-readeable (default)
(see http://nbd.name/gitweb.cgi?p=uci.git;a=commit;h=07d6fd66f6a20e35490bc8b55d26fdb389016120)
zabbix-extra-mac80211 come with a suid helper so that you can still run zabbix as non root user.

Ready to use templates are available here: http://wiki.openwrt.org/doc/howto/zabbix

Please delete files/zabbix_agentd.conf, it's an empty file.

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@free.fr>
git-svn-id: svn://svn.openwrt.org/openwrt/packages@36740 3c298f89-4303-0410-b956-a3cf2f4a3e73