[cern] Add service account to daemonset in traefik

Ricardo Rocha requested to merge 6837traefiksvcaccount into cern-queens

Cherry-pick: https://review.openstack.org/#/c/553789/

This allows traefik to access the resources protected by Kubernetes RBAC

Change-Id: Ia374215dd67afce6125fbfd6e322e5e9d15b4b0b Closes-Bug: #1755844 (cherry picked from commit 79f4cc0c)

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