[qa] Fix race condition in example_test.py
[qa] Fix race condition in example_test.py


Former-commit-id: b937a74f4017c140f18af74bcce23795b387b607
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin