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

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

This patch fixes "error" issues reported by shellcheck
for *.sh files. This patch also moves spaces to tabs.

Test-Parameters: trivial
Test-Parameters: testlist=sanity-scrub,sanity-dom
Test-Parameters: testlist=large-scale
Test-Parameters: testlist=lnet-selftest
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I4d129f26493bc17ee6d5988ae234dace149dfdd3
Reviewed-on: https://review.whamcloud.com/46814
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>