adds support for cisco APIC Rackmount server

[mike1098]

This simple change adds support for Cisco Application Policy Infrastructure Controller. This hardware is basically a bladecenter UCS220

The model info is '{'sys/rack-unit-1': 'APIC'} See also discussion in forum:

https://forum.checkmk.com/t/cisco-ucs-c220-m5-rack-server/42174/3

best regards

Michael

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