Add oom score adj in new CRI implementation.

pkg/kubelet/qos/policy.go

@@ -21,6 +21,10 @@ import (
 )
 
 const (
+	// PodInfraOOMAdj is very docker specific. For arbitrary runtime, it may not make
+	// sense to set sandbox level oom score, e.g. a sandbox could only be a namespace
+	// without a process.
+	// TODO: Handle infra container oom score adj in a runtime agnostic way.
 	PodInfraOOMAdj        int = -998
 	KubeletOOMScoreAdj    int = -999
 	DockerOOMScoreAdj     int = -999