Add more changes relating to authorative only servers #53
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This change disables, the following parameters as they are not relevant in authoritative only server and where causing high CPU usage
I have also changed the default value for dnssec-lookaside, this gives recursive operators a method of disabling dnssec-lookaside. I have added an additional parameter for bindkeys_file instead of having one hard coded in server.conf. the one you have in your config dose not exist on ubuntu 12.04 LTS however the default one (bind.keys) does. I also changed the default of dnssec-validation to auto which i think makes more sense then yes.
Finally it looks like this pull request has some documentation and a few other small fixes missed from my last pull
John