test: add executable flag for rpc_estimatefee.py
test: add executable flag for rpc_estimatefee.py

Former-commit-id: 4544bed63ce0f1ee85a5cc784e255938dc98490a
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin