Cisco WLC monitoring

Update to include more parameters for Cisco WLCs.

Current state of support shows only:

• Interfaces traffic;
• Temperature.

I've discovered Cisco WLC MIBs and how it is implemented in Observium and can supply following info:

• file "includes/definitions/os.inc.php" contains only "$config['os'][$os]['mibs'][] = "AIRESPACE-WIRELESS-MIB";" parameter for WLCs and config seciton for Cisco WLCs doesn't map it to "$config['os'][$os]['group'] = "cisco";" maybe that'll aid in monitoring of some WLC resources;
• MIB file called CISCO-LWAPP-SYS-MIB does containg "clsSysApConnectCount" - number of access points, currently connected to the WLC; I've verified, OID .1.3.6.1.4.1.9.9.618.1.8.4.0 to be working on WLCs w/ SW 7.4 and to be not working w/ SW 7.0, so this feature will be only for new WLCs; also It'll be nice to display this graph at the main page of device to track AP disappearing from WLC;
• MIB file called AIRESPACE-SWITCHING-MIB does contain info about CPU and Memory usage - agentCurrentCPUUtilization, agentTotalMemory, agentFreeMemory;