Node Spec
data class NodeSpec(val configSource: NodeConfigSource? = null, val externalID: String? = null, val podCIDR: String? = null, val podCIDRs: List<String>? = null, val providerID: String? = null, val taints: List<Taint>? = null, val unschedulable: Boolean? = null)
NodeSpec describes the attributes that a node is created with.