IsMaster returns whether a node is a master.

IsServiceAccountToken returns true if the secret is a valid api token for the service account.

NodeReady returns whether a node is ready.

ref: https://github.com/coreos/prometheus-operator/blob/c79166fcff3dae7bb8bc1e6bddc81837c2d97c04/pkg/k8sutil/k8sutil.go#L64 PodRunningAndReady returns whether a pod is running and each container has passed it's ready state.

WaitUntillPodTerminatedByLabel waits until all pods with the label are terminated.