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add master specific key to coredns toleration

Diana Gaponcic requested to merge coredns-tolerations into master

Closes #46 (closed)

Current coredns toleration allows any NoSchedule taint to be ignored, including cordoning broken nodes (cordoning adds key: node.kubernetes.io/unschedulable). By adding the specific master key, we allow coredns to be scheduled on master (as per https://gitlab.cern.ch/kubernetes/automation/releases/cern-magnum/-/blob/master/values.yaml#L840) but still take into consideration cordoning.

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