test: Explain that a bug should be filed when the test fail
Summary: This is a backport of core#19110
Test Plan:
i
Add an assert False to a test.
ninja && test/functional/test_runner.py abc-cmdline
Expected output:
2021-02-23T16:24:12.738000Z TestFramework (ERROR): If this failure happened unexpectedly or intermittently, please file a bug and provide a link or upload of the combined log. 2021-02-23T16:24:12.738000Z TestFramework (ERROR): https://github.com/Bitcoin-ABC/bitcoin-abc/issues 2021-02-23T16:24:12.738000Z TestFramework (ERROR):
Reviewers: #bitcoin_abc, majcosta
Reviewed By: #bitcoin_abc, majcosta
Differential Revision: https://reviews.bitcoinabc.org/D9261