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Wez Furlong
8e067ef01e
This gives a stable order and thus a stable destination site name.
For example:
```
hanmail.net -> MX { exchanges: ["mx4.hanmail.net.", "mx2.hanmail.net.", "mx1.hanmail.net.", "mx3.hanmail.net."], preference: 10 }
```
The MX result from the Resolver sorts groups of hosts by preference
(good!), but the list of exchanges within a given preference level are
in an undefined order.
Sorting the list of exchanges at each priority level gives a consistent
and stable overall ordering.