tests: make blkid/md-raid1-part more robust

tests: make blkid/md-raid1-part more robust

* tests/expected/blkid/mk-raid1-part: Replace major and minor number
of ID_PART_ENTRY_DISK by a special string. Add ID_FS_UUID and
ID_FS_UUID_ENC again, also with a special string.
* tests/ts/blkid/md-raid1-part: Before comparing the expected output
with the actual output, replace the values of ID_PART_ENTRY_DISK,
ID_FS_UUID and ID_FS_UUID_ENC with the speacial strings mentioned above.

Signed-off-by: Bernhard Voelker <mail@bernhard-voelker.de>