Under qemu/kvm the systemProxyForQuery call - when initiated from a
secondary thread - never completes. Consequently the thread hangs, test
fails and the crashes due to the inability to cleanly terminate the test
thread.
Task-number: QTQAINFRA-1200
Change-Id: I9bd4ed163d215fadd8532a03bbdccd80fc8d9cb1
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@qt.io>