Feature add cisco wlc c9800 80 k9

[meni2029]

General information

The Cisco WLC C9800-80-K9 is currently not supported by automatic service discovery for the creation of "AP" services and "Clients" (SSID) services. This is because the OID tree is not in cisco_wlc.py and cisco_wlc_clients.py

Proposed changes

Add the oid of C9800-80-K9 (.1.3.6.1.4.1.9.1.2669) in cisco_wlc.py and cisco_wlc_clients.py. This OID is documented here: https://mibs.observium.org/mib/CISCO-PRODUCTS-MIB/#ciscoC980080K9

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