LTP_SINGLE_FS_TYPE refactoring

[pevik]

TODO: formulate based on tips on ML
https://lore.kernel.org/ltp/Z066Fj9VQVlTOMp_@rei.lan/
https://lore.kernel.org/ltp/Z1mA2wzjW0hpQxUH@yuki.lan/
https://lore.kernel.org/ltp/20250515194826.GB501284@pevik/

Also related Cyril's patch:
lib: LTP_SINGLE_FS_TYPE fix fuse blacklist
https://patchwork.ozlabs.org/project/ltp/patch/20250521095302.13845-1-chrubis@suse.cz/

[pevik]

https://lore.kernel.org/ltp/aC9jOhqDkRwGp9-T@rei/
What about LTP_FORCE_SINGLE_FS_TYPE=ntfs that would do the same as LTP_SINGLE_FS_TYPE=ntfs but would disable the skiplist?

[pevik]

v4 (hopefully to be merged before release): https://patchwork.ozlabs.org/project/ltp/patch/20250526143429.22997-1-chrubis@suse.cz/.

[metan-ucw]

@pevik this can be closed, right?

[pevik]

Implemented in 60656cb.