LU-16827 obdfilter: Fix obdfilter-survery/1a

LU-16827 obdfilter: Fix obdfilter-survery/1a

local_node() under test-framework is used
to determine if the node is remote or local
local_node() returns "true" if the node is
local. Else for remote node it return "false"

This patch fixes obdfilter/1a test case which
which was making reverse logic call to
local_node() to determine remote/local node

This patch modifies local_node() to return
"true"/"false" instead of 0/1

This patch also replaces lctl with $LCTL

Test-Parameters: testlist=obdfilter-survey
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I7bcb483975ec46d9847e0050e5a1f22f68663c80
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51035
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>