test: py: add mkimage dm-verity round-trip test

Add test/py/tests/test_fit_verity.py covering:
 - mkimage writes correct dm-verity properties for matched and
   mismatched block sizes (4096/4096 and 4096/1024);
 - veritysetup verify re-checks the digest against the .itb's
   external data section;
 - mkimage rejects dm-verity images built without -E.

All tests are skipped if veritysetup is not installed on the host.

Signed-off-by: Daniel Golle <[email protected]>
Reviewed-by: Simon Glass <[email protected]>

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