External DNS resolutions sometimes fail

[nima]

Unit-test testCoreDnsInspectInternal section 3.3 reveals the problem concretely:

ASSERT:3.2 expected:<1> but was:<9>

ASSERT:3.3 expected:
<a,google-public-dns-a.google.com,ext,-,-,-,google-public-dns-a.google.com,8.8.8.8,3> but was:
<a,google-public-dns-a.google.com,shn,p,api,site.org,google-public-dns-a.google.com.api.site.org,;;>

See https://travis-ci.org/nima/site/jobs/19152793

Note that this doesn't happen every time.

[nima]

I can't replicate this locally at all, but it seems to happen fairly often on Travis CI.

[nima]

Nope, still bad.