examples: Send only single packets in test_messages

For the burst ACK test, test_messages would send 3 packets. However,
that assumes that the underlying link is fast enough to send three
packets in time, and some devices are hard to operate without underruns
without also specifying a start-of burst timestamp. Often, test_messages
would report that no ACK was received, but instead, an underrun was
received.

test_messages also doesn't need to send three packets. The three packets
came from the "start of burst" flag, which no device in UHD supports.

The change is thus to send a single packet with an EOB marker for the
burst ACK test. This will work regardless of the link speed and CPU
power.

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