Align lifecycle handlers and probes

Align the behavior of HTTP-based lifecycle handlers and HTTP-based
probers, converging on the probers implementation. This fixes multiple
deficiencies in the current implementation of lifecycle handlers
surrounding what functionality is available.

The functionality is gated by the features.ConsistentHTTPGetHandlers feature gate.

pkg/probe/util_test.go

@@ -0,0 +1,43 @@
+/*
+Copyright 2022 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package probe
+
+import (
+	"testing"
+
+	v1 "k8s.io/api/core/v1"
+)
+
+func TestFindPortByName(t *testing.T) {
+	container := v1.Container{
+		Ports: []v1.ContainerPort{
+			{
+				Name:          "foo",
+				ContainerPort: 8080,
+			},
+			{
+				Name:          "bar",
+				ContainerPort: 9000,
+			},
+		},
+	}
+	want := 8080
+	got, err := findPortByName(&container, "foo")
+	if got != want || err != nil {
+		t.Errorf("Expected %v, got %v, err: %v", want, got, err)
+	}
+}