remove rpc-tests.sh which was replaced by Python script
remove rpc-tests.sh which was replaced by Python script

ref. Core commit 5467820be5404fa736436a1202079e764a4308b4
Justaphf/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,marcusdiaz/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,marlengit/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,Bitcoin-com/BUcash,marlengit/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,Justaphf/BitcoinUnlimited,cddjr/BitcoinUnlimited,marlengit/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,BTCfork/hardfork_prototype_1_mvf-bu,krzysztofwos/BitcoinUnlimited,marlengit/hardfork_prototype_1_mvf-bu,BTCfork/hardfork_prototype_1_mvf-bu,marcusdiaz/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,marlengit/hardfork_prototype_1_mvf-bu,krzysztofwos/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,cddjr/BitcoinUnlimited,Bitcoin-com/BUcash,Bitcoin-com/BUcash,BitcoinUnlimited/BitcoinUnlimited,marlengit/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,Bitcoin-com/BUcash,AllanDoensen/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,Justaphf/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,arruah/ensocoin,arruah/ensocoin,arruah/ensocoin,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,Justaphf/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,AllanDoensen/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,krzysztofwos/BitcoinUnlimited,marlengit/hardfork_prototype_1_mvf-bu,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,Bitcoin-com/BUcash,cddjr/BitcoinUnlimited,cddjr/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,Justaphf/BitcoinUnlimited,arruah/ensocoin,marlengit/hardfork_prototype_1_mvf-bu,arruah/ensocoin,BitcoinUnlimited/BitcoinUnlimited,marlengit/hardfork_prototype_1_mvf-bu,marcusdiaz/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,arruah/ensocoin,cddjr/BitcoinUnlimited,marlengit/hardfork_prototype_1_mvf-bu,cddjr/BitcoinUnlimited,Justaphf/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,marlengit/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,Bitcoin-com/BUcash,marlengit/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited