Add luks1 compat image testing.

This test use long keyfile to test proper KDF functionality.
Include images in tarball ans use xz format.
Fix integer type warnings in debug log.
Use proper images with mentioned hashes in luks test.
Fix PBKDF2 for crypto backens which does not support long HMAC keys.

(Or it rehases key in every iteration.)

- Kernel backens seems not to support >20480 HMAC key
- NSS is slow (without proper key reset)

Add some test vectors (commented out by default).