tst_QNetworkReply::ioHttpRedirectPolicy() fails in the CI with Linux Jethro armv7

The test tst_QNetworkReply::ioHttpRedirectPolicy(same-origin-ssl) and tst_QNetworkReply::ioHttpRedirectPolicy(nolesssafe-ssl) have failed 11 times within the last week. Looks the test is flaky, it doesn't necessarily fail the whole integration.

See the testlogs from here:

https://testresults.qt.io/logs/qt/qtbase/16d3286374e18487e3fbb07bde65e54e1d25f79f/LinuxUbuntu_16_04x86_64LinuxBoot2Qt_Jethroarmv7GCCqtci-linux-Ubuntu-16.04-x86_64-1-bd2be3Release/2a48a3b7dcb9652b1532a3ad14de7580b5b9b1/test_1502386427/testlog.txt.gz

http://testresults.qt.io/logs/qt/qtbase/b004bfd9d8b20530e47426bf1657db9025fe3e29/LinuxUbuntu_16_04x86_64LinuxBoot2Qt_Jethroarmv7GCCqtci-linux-Ubuntu-16.04-x86_64-1-bbe656Release/2a48a3b7dcb9652b1532a3ad14de7580b5b9b1/test_1502228444/testlog.txt.gz