[APPROVE?] DNS test fixes

[Jonathan Larmour]

Andrew Lunn wrote:
> We don't require that much:
> 
> 1) A fix IP address we know the name for and thats not going to change.
> 2) A CNAME record for the same IP address.

Better to have an explicit test subdomain, e.g. foo.test.vsr.si. That way 
we can't get in the way of genuinely desirable changes in Iztok's network. 
It's not like the IP addresses themselves have to be appropriate! The only 
data that has to be genuine is the IP addr of the DNS server hosting it.

Jifl
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