[LTP] [PATCH] isofs: Convert to new library

[Petr Vorel]

Hi Joerg,

> You correctly removed getopt options: -n just set NO_CLEANUP, which is not used
> any more on test.sh. Both libraries support TST_NO_CLEANUP, so we should
> document it (going to send a patch).
In the end I just merged that simple doc change.
I wonder if there would be use for variable keeping $TST_TMPDIR (because it's
deleted even with $TST_NO_CLEANUP).

Kind regards,
Petr