move arp table polling out of cisco mac accounting file, this works on other devices as well - tested on linux/net-snmp and junos

git-svn-id: http://www.observium.org/svn/observer/trunk@678 61d68cd4-352d-0410-923a-c4978735b2b8

discovery.php

@@ -80,6 +80,8 @@ while ($device = mysql_fetch_array($device_query)) {
   ## CDP & LLDP
   include("includes/discovery/cdp-lldp.inc.php");
 
+  ## ARP Table
+  include("includes/discovery/arp-table.php");
 
   if($device['os'] == "netscreen") { 
     if ($device['type'] == "unknown") { $device['type'] = 'firewall'; }