tst_QUdpSocket::linkLocalIPv6(WithoutProxy) is flaky

cd ../ && /Users/qt/work/qt/qtbase/tests/auto/network/socket/qudpsocket/test/target_wrapper.sh  ./tst_qudpsocket linkLocalIPv6
********* Start testing of tst_QUdpSocket *********
Config: Using QtTest library 5.9.1, Qt 5.9.1 (x86_64-little_endian-lp64 shared (dynamic) release build; by Clang 8.0.0 (clang-800.0.42.1) (Apple))
PASS   : tst_QUdpSocket::initTestCase()
QDEBUG : tst_QUdpSocket::linkLocalIPv6(WithoutProxy) QHostAddress("fe80::1%lo0")
QDEBUG : tst_QUdpSocket::linkLocalIPv6(WithoutProxy) QHostAddress("fe80::4be:d078:99b7:a002%en0")
QDEBUG : tst_QUdpSocket::linkLocalIPv6(WithoutProxy) QHostAddress("fe80::494f:1662:88f5:ac09%utun0")
FAIL!  : tst_QUdpSocket::linkLocalIPv6(WithoutProxy) '(neutralReadSpy.count() > 0)' returned FALSE. ()
   Loc: [../tst_qudpsocket.cpp(1592)]
PASS   : tst_QUdpSocket::cleanupTestCase()
Totals: 2 passed, 1 failed, 0 skipped, 0 blacklisted, 26346ms
********* Finished testing of tst_QUdpSocket *********
make: *** [check] Error 1