[cern] set cern-waitdns false, drop cern-services

Ricardo Rocha requested to merge 7807waitdns into cern-queens

Following the introduction of the waitdns and active-directory flags, drop the setting of cern-services leaving default to True, and set cern-waitdns to false instead. This will allow nodes to not wait for dns registration but still get registered in active directory.

Fixes OS-7807

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