In this commit we:
1. Use `tmt tests import` to gather all related
metadata from tests/Support-local-additions-to-magic-files
and tests/command-line-options directories and
convert them into tmt format.
2. Add missing requirement for bzip2 in
tests/command-line-options/{Makefile,main.fmf}
files.
3. Replace an obsolescent `egrep` with a `grep -E`
command in the tests/command-line-options/runtest.sh
file.
4. Create new tests/file-tests/Makefile file.
5. Use `tmt tests import` to convert the
tests/file-tests and all related
metadata into tmt format.
6. Simplify and update tests/file-tests/{prepare.sh,
runtest.sh,reference.sh,readfile.py} scripts.
Thank you lzaoral!
7. Update and create new "references" (file-5.42.4 outputs)
in the file-tests/reference.
8. Rename the file-tests/blacklist.txt to
file-tests/blocklist.txt.
9. Replace the tests/tests.yml file with
the plans/file-CI-plan.fmf file.
