mysql-routers in error state when deploying barbican

[Marian Gasparovic]

After `sunbeam enable caas` barbican-mysql-router units went to error state

barbican-mysql-router/0 error idle 10.1.155.114 hook failed: "update-status"
barbican-mysql-router/1 error idle 10.1.29.189 hook failed: "backend-database-relation-changed"
barbican-mysql-router/2* active executing 10.1.37.49
barbican-mysql/0 maintenance idle 10.1.37.51 joining the cluster
barbican-mysql/1* maintenance idle 10.1.155.116 Unable to get member state
barbican-mysql/2 waiting idle 10.1.29.191 waiting to get cluster primary from peers

Logs and artifacts - https://oil-jenkins.canonical.com/artifacts/cc4e0b9f-117a-411f-b84a-454661b76af0/index.html

[James Page (james-page)]

https://github.com/canonical/mysql-k8s-operator/issues/339