[qa] added doctest to test_classes.py to verify that we can get the full command
[qa] added doctest to test_classes.py to verify that we can get the full command

This will be needed so that the test runner can distinguish tests that are invoked
with the same script, but different options.
marcusdiaz/BitcoinUnlimited,cddjr/BitcoinUnlimited,marlengit/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,BitcoinUnlimited/BitcoinUnlimited,Justaphf/BitcoinUnlimited,marlengit/hardfork_prototype_1_mvf-bu,krzysztofwos/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,BitcoinUnlimited/BitcoinUnlimited,arruah/ensocoin,arruah/ensocoin,AllanDoensen/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,Bitcoin-com/BUcash,BitcoinUnlimited/BitcoinUnlimited,cddjr/BitcoinUnlimited,Justaphf/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,Justaphf/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,marlengit/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,arruah/ensocoin,BTCfork/hardfork_prototype_1_mvf-bu,BTCfork/hardfork_prototype_1_mvf-bu,marlengit/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,krzysztofwos/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,marlengit/hardfork_prototype_1_mvf-bu,AllanDoensen/BitcoinUnlimited,marlengit/hardfork_prototype_1_mvf-bu,marcusdiaz/BitcoinUnlimited,arruah/ensocoin,AllanDoensen/BitcoinUnlimited,Justaphf/BitcoinUnlimited,cddjr/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,BTCfork/hardfork_prototype_1_mvf-bu,arruah/ensocoin,cddjr/BitcoinUnlimited,marlengit/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,marlengit/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,cddjr/BitcoinUnlimited,Bitcoin-com/BUcash,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,Justaphf/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,Bitcoin-com/BUcash,Bitcoin-com/BUcash,BitcoinUnlimited/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,marlengit/hardfork_prototype_1_mvf-bu,cddjr/BitcoinUnlimited,arruah/ensocoin,marlengit/hardfork_prototype_1_mvf-bu,Bitcoin-com/BUcash,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,krzysztofwos/BitcoinUnlimited,marlengit/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,Bitcoin-com/BUcash,AllanDoensen/BitcoinUnlimited,marlengit/hardfork_prototype_1_mvf-bu,Justaphf/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited