fix flake8 reported issues, run tests

[sandrobonazzola]

Cleaned up the code, added automated tests.

Not adding all the unit tests at once as they are failing on my laptop. I'll enable all tests in a different PR once this is in.

Coverage report: 25%

coverage.py v6.5.0, created at 2022-10-25 10:15 +0000

Module	statements	missing	excluded	coverage
drop_buffer_cache.py	33	15	0	55%
fallocate.py	35	17	0	51%
parser_data_types.py	49	27	0	45%
smallfile.py	1450	1181	0	19%
smf_test_params.py	98	69	0	30%
sync_files.py	47	36	0	23%
yaml_parser.py	145	57	0	61%
Total	1857	1402	0	25%

coverage.py v6.5.0, created at 2022-10-25 10:15 +0000

Signed-off-by: Sandro Bonazzola [email protected]