CTT: 1.03.341.385 and 1.03.340.380

This test case fails due to a race condition between the server's publishing interval
and the write request.

Error: Publish() response did not complete within the expected time-frame.
Expected a value less than <11000> and greater than <9000> but received <16251>.

The test starts a subscription with Publishing Interval = 5.000s + MaxKeepAliveCount = 1

2 Publish requests are sent initially,
the first write is sent after 5.020s, and the publishing thread wakes up shortly after
the write. So the first publish response collects the written values, and at the
time when the test expects the second publish response, there are no new data,
the keepalive happens after another 5.000s

Suggest to add a 500ms delay before sending the write request,
thus allow 10% drift in the publishing interval.

    // write to ALL items
    PublishHelper.WaitInterval( { Items: items, Subscription: subscription } );
    UaDateTime.CountDown({ Msecs: 500, SuppressMessage: true }); // added an additional 500ms delay here
    WriteHelper.Session.write( writeRequest, writeResponse );
    if (writeResponse.ResponseHeader.ServiceResult.isBad()) return (false);