Backport of docker: configure restart policy for networking pause container into release/1.2.x #15741
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Backport
This PR is auto-generated from #15732 to be assessed for backporting due to the inclusion of the label backport/1.2.x.
The below text is copied from the body of the original PR.
This PR modifies the configuration of the networking pause contaier to include the "unless-stopped" restart policy. The pause container should always be restored into a running state until Nomad itself issues a stop command for the container.
This is not a perfect fix for #12216 but it should cover the 99% use case - where a pause container gets accidentally killed / exits for some reason. There is still a possibility where the pause container and main task container are stopped and started in the order where the bad behavior persists, but this is fundamentally unavoidable due to how docker itself abstracts and manages the underlying network namespace referenced by the containers.
Closes #12216