Since we use "sleep infinity" in kolla_toolbox container - stopping it
always ends up with exit code 143.

Let's use a wrapper script that handles signals correctly.

Closes-Bug: #2031692

Depends-On: https://review.opendev.org/c/openstack/kolla/+/891777
Change-Id: I84295b909d788ceb67bf09ef60fb0583108b111b