Pubsubbeats deployment should restart pods on configmap change

Created by: ElizabethStirling

Currently, we need to use kubectl rollout restart deployment/pubsubbeatto tell it to restart the instances. There's probably some magic to get it to restart the pods when the configmap change, so that we don't need to manually tell it to reboot - we want to make sure it shuts down cleanly to prevent us from loosing logs in memory as well.