tst_qsocks5socketengine::passwordAuth2 is flaky

agent:2019/03/01 08:00:28 build.go:192: QWARN  : tst_QSocks5SocketEngine::passwordAuth2() QAbstractSocket::connectToHost() called when already looking up or connecting/connected to "danted.test-net.qt.local"
agent:2019/03/01 08:00:58 build.go:192: FAIL!  : tst_QSocks5SocketEngine::passwordAuth2() 'socketDevice.waitForRead()' returned FALSE. ()
agent:2019/03/01 08:00:58 build.go:192:    Loc: [tst_qsocks5socketengine.cpp(881)]

** snip, rerun: **

agent:2019/03/01 08:02:01 build.go:192: QDEBUG : tst_QSocks5SocketEngine::passwordAuth2() [     0.000 D] default tst_QSocks5SocketEngine::passwordAuth2 - 14, Connection to proxy refused
agent:2019/03/01 08:02:01 build.go:192: FAIL!  : tst_QSocks5SocketEngine::passwordAuth2() Compared values are not the same
agent:2019/03/01 08:02:01 build.go:192:    Actual   (socketDevice.state())           : UnconnectedState
agent:2019/03/01 08:02:01 build.go:192:    Expected (QAbstractSocket::ConnectedState): ConnectedState
agent:2019/03/01 08:02:01 build.go:192:    Loc: [tst_qsocks5socketengine.cpp(877)]