Tests for qdnslookup prevents a lot of qtbase integrations

Following kind of failures are regularly failing qtbase/5.9 integrations:

FAIL! : tst_QDnsLookup::lookup(normal:any-multi) Compared values are not the same Actual (addresses.join(';')): "2001:db8::1:1;2001:db8::1:2" Expected (host) : "198.51.100.1;198.51.100.2;198.51.100.3;2001:db8::1:1;2001:db8::1:2" tst_qdnslookup.cpp(258) : failure location

Started happening at 9th of February 2018 sometime at around 8:00 UTC.

Also this type of failures have been seen:

PASS   : tst_QDnsLookup::lookup(normal:any-a-single)
FAIL!  : tst_QDnsLookup::lookup(normal:any-a-plus-aaaa) Compared values are not the same
   Actual   (addresses.join(';')): "198.51.100.1"
   Expected (host)               : "198.51.100.1;2001:db8::1:1"
   Loc: [tst_qdnslookup.cpp(258)]

At least following integrations are failing:

http://10.212.3.36/coin/integration/qt/qtbase/tasks/1518171029

http://10.212.3.36/coin/integration/qt/qtbase/tasks/1518170855

http://10.212.3.36/coin/integration/qt/qtbase/tasks/1518164846

http://10.212.3.36/coin/integration/qt/qtbase/tasks/1518159918

Grafana link shows it has failures every now and then (some problems with external DNS?):

https://testresults.qt.io/grafana/dashboard/db/coin-single-test-details?orgId=1&var-project=qt%2Fqtbase&var-testcase=tests%2Fauto%2Fnetwork%2Fkernel%2Fqdnslookup&var-testfunction=All&var-branch=5.10&var-branch=5.6&var-branch=5.6.3&var-branch=5.9&var-branch=5.9.2&var-branch=dev&var-inter=4h&from=now-6M&to=now