[Dovecot] dovecot2 auth-worker socket perms ignoring assigned ownership settings in conf.d/10-master.conf?

[mephistopheles at operamail.com]

> It was *not* easy to figure that out; none of the postfix/dovecot
> how-to's have been updated for dovecot 2.

Fwiw, this looks useful

 Authentication process user
  http://wiki2.dovecot.org/UserIds

Trying to get those $default_... redefined.  No luck yet.