libblkid: iso9660: add new test images

libblkid: iso9660: add new test images

Image iso-different-iso-joliet-label contains different identifiers in ISO
and Joliet locations. Identifiers are prefixed with "ISO" or "Joliet"
string to verify that UNICODE Joliet has preference over ASCII ISO.

Image iso-unicode-long-label contains very long identifiers in ISO location
which do not fit into the Joliet location. In ISO location is UNICODE
character 'ï' replaced by '_' and unrepresentable spaces also by '_'.
This test verifies that libblkid can use first half of identifiers from
Joliet (which contains UNICODE) and second half from ISO which is just
uppercase and only small subset of ASCII. This image was generated by Nero
Linux software and basically this truncate and '_' replacement is done by
default for any long or UNICODE label.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>