LU-15555 tests: fix conf_sanity 110 and 111

LU-15555 tests: fix conf_sanity 110 and 111

The large_dir option is in the kernel now. This broke conf_sanity
110 and 111. Block size is not set to 1024 and created names
are not enougth to fill two htree levels.

This patch fixes conf_sanity 110 and 111.

Fixes: 8048e216c1 ("LU-1365 tests: LARGEDIR and 3-level htree for local ldiskfs")
Test-Parameters: trivial testlist=conf-sanity mdssizegb=20 env=SLOW=yes,ONLY="110 111",ONLY_REPEAT=10
Change-Id: I4b5c7b68e1afe7f04a3b1d85c11f505ac43cda54
Signed-off-by: Artem Blagodarenko <artem.blagodarenko@hpe.com>
Signed-off-by: Elena Gryaznova <elena.gryaznova@hpe.com>
HPE-bug-id: LUS-10730
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/46570
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Artem Blagodarenko <ablagodarenko@ddn.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>