[LTP] [AOSP/Android] Better handling required user and group

[Petr Vorel]

Hi Edward, Sandeep, all,

we have some long going ticket about better handling users groups in ticket #468.
I recently updated it with new proposal [1]. Then I noticed AOSP requires
SAFE_GETGRNAM_FALLBACK() [2].

I wonder how to do a proper solution in the LTP C API (which would be then
reused in LTP shell API). Could you please post what would work for AOSP
testing? (ideally to the ticket so that we keep the discussion on single place,
but it could be also here).

Kind regards,
Petr

[1] https://github.com/linux-test-project/ltp/issues/468#issuecomment-2320992135
[2] https://github.com/linux-test-project/ltp/issues/468#issuecomment-2324376728