ReserveMemory creates a replication controller with pods that, in summation, request the specified amount of memory.

ReserveMemoryWithPriority creates a replication controller with pods with priority that, in summation, request the specified amount of memory.

ReserveMemoryWithSelector creates a replication controller with pods with node selector that, in summation, request the specified amount of memory.

WaitForClusterSizeFunc waits until the cluster size matches the given function.

WaitForClusterSizeFuncWithUnready waits until the cluster size matches the given function and assumes some unready nodes.

CriticalAddonsOnlyError implements the `error` interface, and signifies the presence of the `CriticalAddonsOnly` taint on the node.

HPAScaleTest struct is used by the scale(...) function.