better way to check for DNS stuff

[jeevanullas]

Hi All,

The instancetest.py has a check for DNS DNSResolveChecks

https://github.com/eucalyptus/eutester/blob/testing/testcases/cloud_user/instances/instancetest.py#L188-L233

This is great, but even if nslookup fails, the output would have a string 'answer:' , we should devise a better mechansim to check for ERROR and PASS.

Also the DNS experts do not recommend nslookup, instead they recommend dig, which also sends a return value back.

Cheers!
Deependra

[viglesiasce]

Fixed in testing branch