[Twisted-Python] Twisted Names Deprecation Warning Fixes

[Peter Kropf]

In the Twisted pseudo-sprint yesterday, I made some changes to the 
doc/names/examples/testdns.py and twisted/names/dns.py to clean up the 
deprecation warnings. Attached are two svn diffs of the changes made. 
I've run the trials for twisted names and everything passes with the 
exception of testIPv6. That was skipped since I'm not using IPv6 on my 
laptop. Would someone please review them and commit the changes to SVN?

There's also a deprecation warning in twisted/names/client.py that I'll 
try to get to while at the pycon...

Thanks.

- Peter

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