tst_QTcpSocket::disconnectWhileLookingUp required the host lookup +
connect + disconnect procedure to complete in <50ms, which is not always
true.
When disconnecting (rather than aborting with close()), wait for the
disconnection to complete with a timeout of 5 seconds.
Task-number: QTBUG-21043
Change-Id: I3b59abf9a8eb2c6d99416e1a8ec6b528885b656e
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>