[LU-16527] some directory layout inheritance fixes

Mon, 13 Mar 2023 06:08:03 +0000

fixes for some minor problems:

it may happen that the depth is not set on a dir, do not consider
depth == 0 as a real depth while checking if the root default is
applicable;
setdirstripe util implicitely sets max_inherit to 3 for non-striped
dir when -i option is given but -c is not; at the same time 3 is the
default for striped dirs only;
getdirstripe shows inherited default layouts with max_inherit==0,
whereas it has no sense anymore; the same for an explicitely set
default layout on a dir/root with max_inherit==0;
getdirstripe hides max_inherit_rr when stripe_offset != -1 as it has
no sense and reset to 0, however it leads to user confusion;

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