LU-14707 tests: Bashify more scripts for Ubuntu et. al.

LU-14707 tests: Bashify more scripts for Ubuntu et. al.

Some scripts that are not POSIX sh are being
invoked using sh. The scripts should be called
using the shell listed in the shebang.

Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: I7233ce56df95a5b8698b39872e6118a4fa1a029a
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49296
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Aurelien Degremont <degremoa@amazon.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>