test: Namespace core files with the test name
test: Namespace core files with the test name

When multiple tests core dump, this makes it possible to check each of
them instead of having to run them individually.

Signed-off-by: Guillem Jover <6f269179bd29909dac5e2359bafef574d0759c09@hadrons.org>

axboe/liburing,axboe/liburing,axboe/liburing