ffb033a test: List any failed tests at the end of test_runner output (Anthony Towns)
f92541f test: Make summary row bold-red if any test failed (Wladimir J. van der Laan)
Pull request description:
Make the summary row of the test runner bold red if *any* test fails. This helps visibility if something fails. (yesteryday I had a snafu where I missed that `feature_blocksdir.py` had failed because it's one of the earlier tests in the list, this intends to avoid that in the future) Before: ![testfailold](https://user-images.githubusercontent.com/126646/38021100-3fbaf1c6-327c-11e8-8bae-d3ba46e77408.png) After: ![testfailnew](https://user-images.githubusercontent.com/126646/38021108-43ac7ef8-327c-11e8-8566-e52bcbaf89b8.png) If tests pass it still looks the same: ![testok](https://user-images.githubusercontent.com/126646/38021115-4a8e9954-327c-11e8-8fe4-34e889384d3e.png)
Tree-SHA512: 057748c693ca1c80840e4e4cdea8aa1baf8996f03d6805975d8e3c07c4ba0087cd8fa83f891d6bf1af0bfbba88b5d46bd5d852df340d755202bd32ae6f1034b5
Backport of Core PR12811
https://github.com/bitcoin/bitcoin/pull/12811/