pkg/vcs: fix config bisection tests more

config-bisect.pl uses bash-isms and can't run on non-linux.
It also silently ignores all errors which made failures
very obscure -- the script happily succeeds in presence
of any errors. So the test failed later reading .config.
Use "set -eu" to not fail silently.
Also trace all config-bisect.pl invocations and output.
good/bad decisions are important and we always log them
in the normal bisection.

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