Unifi Wireless Client statistics

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As suggested by @laf in #4266, this adds wireless client counts to Gen2 Unifi UAPs which have the most recent firmware applied. While I ran through the pre-commit php check and other checks, I think this needs another conditional before being applied. Unifi will have APs which do not support, as well as switchs / routers / etc which have no wifi at all. I wasn't sure what conditional would be appropriate here; while there are presently 3 hardware devices which support this, more will probably be added going forward. I would think it could be possible to check to see if oid .1.3.6.1.4.1.41112.1.6.1.2.1.8.0 is populated. If it is, poll for the clients and if not, don't! But, I'm not enough of an expert on this to know really :-)

I also wasn't sure if "radio0" / "radio1" were appropriate. I just copied those from the cisco section above. The radio0 should be the 2.4GHZ radio and radio 1 is the 5GHZ.

[scrutinizer-notifier]

The inspection completed: No new issues

[laf]

That's fine for now.

I also don't see an issue with the snmpgets failing for devices that don't support it. The os check for unifi restricts it just wireless devices and it's only 1 additional snmpget if the first fails.