Change CPU sample sanitization in HPA.

Ignore samples if:
- Pod is beeing initalized - 5 minutes from start defined by flag
    - pod is unready
    - pod is ready but full window of metric hasn't been colected since
    transition
- Pod is initialized - 5 minutes from start defined by flag:
    - Pod has never been ready after initial readiness period.

pkg/controller/podautoscaler/horizontal_test.go

@@ -286,8 +286,9 @@ func (tc *testCase) prepareTestClient(t *testing.T) (*fake.Clientset, *metricsfa
 					Phase: podPhase,
 					Conditions: []v1.PodCondition{
 						{
-							Type:   v1.PodReady,
-							Status: podReadiness,
+							Type:               v1.PodReady,
+							Status:             podReadiness,
+							LastTransitionTime: podStartTime,
 						},
 					},
 					StartTime: &podStartTime,
@@ -465,6 +466,7 @@ func (tc *testCase) prepareTestClient(t *testing.T) (*fake.Clientset, *metricsfa
 					Labels:    labelSet,
 				},
 				Timestamp: metav1.Time{Time: time.Now()},
+				Window:    metav1.Duration{Duration: time.Minute},
 				Containers: []metricsapi.ContainerMetrics{
 					{
 						Name: "container",
@@ -648,7 +650,7 @@ func (tc *testCase) setupController(t *testing.T) (*HorizontalController, inform
 		return true, obj, nil
 	})
 
-	replicaCalc := NewReplicaCalculator(metricsClient, testClient.Core(), defaultTestingTolerance, defaultTestingCpuTaintAfterStart, defaultTestingDelayOfInitialReadinessStatus)
+	replicaCalc := NewReplicaCalculator(metricsClient, testClient.Core(), defaultTestingTolerance, defaultTestingCpuInitializationPeriod, defaultTestingDelayOfInitialReadinessStatus)
 
 	informerFactory := informers.NewSharedInformerFactory(testClient, controller.NoResyncPeriodFunc())
 	defaultDownscaleForbiddenWindow := 5 * time.Minute