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Up until now UnifiedControlPlaneImage existed as a string value as part of the ClusterConfiguration. This provided an override for the Kubernetes core component images with a single custom image. It is mostly used to override the control plane images with the hyperkube image. This saves both bandwith and disk space on the control plane nodes. Unfortunately, this specified an entire image string (complete with its prefix, image name and tag). This disables upgrades of setups that use hyperkube. Therefore, to enable upgrades on hyperkube setups and to make configuration more convenient, the UnifiedControlPlaneImage option is replaced with a boolean option, called UseHyperKubeImage. If set to true, this option replaces the image name of any Kubernetes core components with hyperkube, thus allowing for upgrades and respecting the image repository and version, specified in the ClusterConfiguration. Signed-off-by: Rostislav M. Georgiev <rostislavg@vmware.com>