avoiding auth ndb entry for your plan9 site

here is a trick that lets one mount a plan9 filesystem on another site without having to create a ndb entry to specify the domain name of the auth server.

when your auth domain is also your dns domain name. one can register p9auth subdomain and point it to your auth server:

lets say your dom is example.com, then your auth server becomes p9auth.example.com.

this works as authdial() in libauthsrv uses that default subdomain if here are no keys in your ndb for that particular auth domain.

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