Stop using trolltech.com and troll.no URLs in QTcpSocket autotest

The QTcpSocket autotest (qtbase/tests/auto/network/socket/qtcpsocket/tst_qtcpsocket.cpp) uses several trolltech.com and troll.no URL's. These domains are not guaranteed to keep working in the future, and much of the troll.no domain cannot be accessed from outside Nokia (meaning that the test would fail for non-Nokia users). Publicly accessible URL's should be used instead.