travis: 'make check' in parallel and verbose
travis: 'make check' in parallel and verbose

- 'make check' in parallel, since the log will take care of clean output
- 'make check' verbose, so that test failure causes aren't hidden

krzysztofwos/BitcoinUnlimited,cddjr/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,arruah/ensocoin,arruah/ensocoin,marcusdiaz/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,marlengit/BitcoinUnlimited,marlengit/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,AllanDoensen/BitcoinUnlimited,marlengit/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,BitcoinUnlimited/BitcoinUnlimited,Bitcoin-com/BUcash,Bitcoin-com/BUcash,BitcoinUnlimited/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,cddjr/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,arruah/ensocoin,BitcoinUnlimited/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,Justaphf/BitcoinUnlimited,Justaphf/BitcoinUnlimited,cddjr/BitcoinUnlimited,arruah/ensocoin,krzysztofwos/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,cddjr/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,AllanDoensen/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,marcusdiaz/BitcoinUnlimited,arruah/ensocoin,BTCfork/hardfork_prototype_1_mvf-bu,arruah/ensocoin,Bitcoin-com/BUcash,BTCfork/hardfork_prototype_1_mvf-bu,Justaphf/BitcoinUnlimited,Justaphf/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,marlengit/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,BTCfork/hardfork_prototype_1_mvf-bu,cddjr/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,Justaphf/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,marlengit/BitcoinUnlimited,Justaphf/BitcoinUnlimited,Bitcoin-com/BUcash,Bitcoin-com/BUcash,BitcoinUnlimited/BitcoinUnlimited,marlengit/BitcoinUnlimited,cddjr/BitcoinUnlimited,Bitcoin-com/BUcash