Keep-going mode for test-ref-configs

[gilles-peskine-arm]

test-ref-configs.pl tests multiple configurations in succession. If there's a failure, it gives up. This is annoying, especially on the CI, because if a configuration fails, you don't get any feedback on the rest of the configurations.

all.sh and depends.py have an option to select between error-stop mode and keep-going mode. The goal of this task is to add a similar option to test-ref-configs.

This can either be done by modifying the existing script or after rewriting it in Python.

[gilles-peskine-arm]

I have some old work in progress on test_ref_configs.py which has a keep-going mode.