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

[Joerg Vehlow]

Hi Petr,

thanks for merging
>> 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).
I think that was the reason why I completely removed the flag in the 
first place.
Also I did not see any reason to keep the tempdir. If I ever needed this 
in the past, I just modified the test.

Jörg