Remove waitwithoutgui testlib selftest

Remove waitwithoutgui testlib selftest

This test is not useful for finding bugs in qtestlib's logging code,
because it bypasses the qtestlib loggers and doesn't play nice with
tst_selftest.  Neither is this test very useful for finding bugs in
QTest::qWait(), as the test only proves the qWait() terminates, not that
it waits accurately, or even that it waits at all.

Change-Id: Ia5dd7cbaf3a6fbb4e94e54ed155263580e495694
Reviewed-on: http://codereview.qt-project.org/5173
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>