Skip unstable tst_QSslSocket test case.

The connection to qt-project.org seems to be the one that causes this
particular test case to fail.

Task-number: QTBUG-29941
Change-Id: Ie5e430646997e86e3acb04132cd90a1773a091da
Reviewed-by: Richard J. Moore <rich@kde.org>
Reviewed-by: Peter Hartmann <phartmann@blackberry.com>

tests/auto/network/ssl/qsslsocket/tst_qsslsocket.cpp

@@ -706,6 +706,8 @@ void tst_QSslSocket::peerCertificateChain()
     if (!QSslSocket::supportsSsl())
         return;
 
+    QSKIP("QTBUG-29941 - Unstable auto-test due to intermittently unreachable host");
+
     QSslSocketPtr socket = newSocket();
     this->socket = socket.data();