LU-18851 tests: fix nodelist in sanity/170b

LU-18851 tests: fix nodelist in sanity/170b

on a local setup nodes_list should contain just a single entry

Fixes: 8091e481fc ("LU-18810 misc: filename encoding for remaining files")
Test-Parameters: trivial
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: Ie855dcf6c2f7a62c3fcf3913fe43d8a8c58e54e2
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/58540
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Emoly Liu <emoly@whamcloud.com>