Version fix

[Christian-B]

The test board spinn-4.cs.man.ac.uk was down which allowed some bugs to creep in.
This because the test where skipped

Before approving this PR please restart spinn-4.cs.man.ac.uk and rerun the tests

1. BoardTestConfiguration changed from using a cfg file to a trial and error method

• Will try a 4 Chip board first than spinn-4.cs.man.ac.uk and then 192.168.240.1
• (minus) This will make the unit test take longer 45s instead of 19s if all three options are not pingable
• (plus) Automatically uses three different options so more likely to run the tests rather than skipping
• Can still be changed locally but by editing board_test_configuration.py rather than board_test_configuration.cfg

2. BoardTestConfiguration now set cfg Machine/version so unittest_setup() needs to be called first

3. Transceiver unittest use some private properties as they are testing/ using things not required by the normal runs.
   Alternatives are:

4. Add api methods just for testing

5. Remove the Tests

Depends on:
SpiNNakerManchester/SpiNNMachine#218
SpiNNakerManchester/SpiNNFrontEndCommon#1098
tested by:
SpiNNakerManchester/IntegrationTests#223

[Christian-B]

blocker if spinn-4.cs.man.ac.uk is on