TBR: tools/shelltest-runner: fixes
TBR: tools/shelltest-runner: fixes

- Ignore any build errors because they are likely caused by outdated packages.
- Return an error when some tests failed.

Change-Id: I974794e2badc17fda1557688511c8080ac65705b

vanadium/go.devtools,vanadium/go.devtools,vanadium/go.devtools