LU-15626 tests: Fix "error" reported by shellcheck (2/5)

LU-15626 tests: Fix "error" reported by shellcheck (2/5)

This patch fixes "error" issues reported by shellcheck
for file lustre/tests/test-framework.sh. This patch also
moves spaces to tabs.

Change-Id: Ib2bb4e864ef0032f2906bf7e0f9ad0542a8411b3
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49436
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: Aurelien Degremont <degremoa@amazon.com>