test: Add workaround for docker restart issue
test: Add workaround for docker restart issue

The version of docker.service on Debian ships a bad
KillMode setting. See:

https://github.com/docker/docker/blob/master/contrib/init/systemd/docker.service#L25

Closes #4967
Reviewed-by: Dominik Perpeet <f7830b2723a5db4fc185058b06cfab4b89a38da9@redhat.com>

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