test-runner: Simplify and slightly refactor the disk test #641
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Per #553, we've made the test runner always expect to be running in the special QEMU env, so we don't need to have a separate "works with any env" disk test from the more detailed "known disk" test. So, collapse the
media/{mod.rs, known_disk.rs}
directory to justmedia.rs
.Also simplify the big disk test function a little by moving the loop to find the test disk into a new function.
Should be no functional change to what is being tested, just a little easier to read now.
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