The test scripts hardcoded #!/bin/bash while they are not really
requiring bash. Use the more portable #!/usr/bin/env sh instead, so that
they use the default shell.
Signed-off-by: Tom Wieczorek <twieczorek@mirantis.com>
Signed-off-by: MrJack <36191829+biagiopietro@users.noreply.github.com>