zabbix: update to zabbix 3.0.1

zabbix-agent doesn't exist anymore since 3.0

'-f' option (foreground) is now in zabbix-agentd

003-change-user-and-foreground.patch fixes pending
issue https://support.zabbix.com/browse/ZBX-10611

you might need to update your config file to add
LogType=system

Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>

admin/zabbix/files/zabbix_agentd.init

@@ -16,6 +16,8 @@ start_service() {
 	procd_open_instance
 	procd_set_param command ${PROG} -c ${CONFIG} -f
 	procd_set_param respawn
+	procd_set_param stdout 1
+	procd_set_param stderr 1
 	procd_close_instance
 }