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

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

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

Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Ic0d1046577dacf242787841b64319a6e206bae22
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49439
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Aurelien Degremont <degremoa@amazon.com>