LU-18427 script: allow llog removal scripts on ZFS

LU-18427 script: allow llog removal scripts on ZFS

Make both scripts working also for ZFS mounts

Signed-off-by: Mikhail Pershin <mpershin@whamcloud.com>
Change-Id: I713548caa2f11af334c7bd10c07ecc81c387f5e1
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56906
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Olaf Faaland <faaland1@llnl.gov>