Consolidate sysctl commands for kubelet

These commands are important enough to be in the Kubelet itself.
By default, Ubuntu 14.04 and Debian Jessie have these set to 200 and
20000. Without this setting, nodes are limited in the number of
containers that they can start.

pkg/kubelet/cm/container_manager_linux.go

@@ -312,6 +312,8 @@ func setupKernelTunables(option KernelTunableBehavior) error {
 		utilsysctl.VmPanicOnOOM:       utilsysctl.VmPanicOnOOMInvokeOOMKiller,
 		utilsysctl.KernelPanic:        utilsysctl.KernelPanicRebootTimeout,
 		utilsysctl.KernelPanicOnOops:  utilsysctl.KernelPanicOnOopsAlways,
+		utilsysctl.RootMaxKeys:        utilsysctl.RootMaxKeysSetting,
+		utilsysctl.RootMaxBytes:       utilsysctl.RootMaxBytesSetting,
 	}
 
 	sysctl := utilsysctl.New()