Use healthEndpoint if defined when transforming a server port

If a custom healthEndpoint is defined it should be used otherwise k8s will never mark the node as ready.

I encountered this bug with the below config.

```yaml

profiles:
  gate:
    servlet:
      context-path: /api/v1

service-settings:
  gate:
    healthEndpoint: /api/v1/health
     server:
       port: 9002
     default:
       apiPort: 8085
       legacyServerPort: 8084

```

Related to spinnaker/spinnaker#2533

pkg/deploy/spindeploy/transformer/serverport.go

@@ -34,6 +34,11 @@ func (g *ServerPortTransformerGenerator) GetName() string {
 }
 
 func (t *serverPortTransformer) transformDeploymentManifest(ctx context.Context, deploymentName string, deployment *v1.Deployment) error {
+	healthEndpoint, err := t.svc.GetSpinnakerConfig().GetServiceConfigPropString(ctx, deploymentName, "healthEndpoint")
+	if err != nil  {
+	   	healthEndpoint = "/health"
+	}
+
 	if targetPort, _ := t.svc.GetSpinnakerConfig().GetServiceConfigPropString(ctx, deploymentName, "server.port"); targetPort != "" {
 		intTargetPort, err := strconv.ParseInt(targetPort, 10, 32)
 		if err != nil {
@@ -50,7 +55,7 @@ func (t *serverPortTransformer) transformDeploymentManifest(ctx context.Context,
 				if !strings.Contains(cmd, "http://localhost") {
 					continue
 				}
-				c.ReadinessProbe.Exec.Command[i] = fmt.Sprintf("http://localhost:%d/health", intTargetPort)
+				c.ReadinessProbe.Exec.Command[i] = fmt.Sprintf("http://localhost:%d%s", intTargetPort, healthEndpoint)
 			}
 		}
 	}

pkg/deploy/spindeploy/transformer/serverport_test.go

@@ -23,3 +23,18 @@ func TestTransformManifests_CustomServerPort(t *testing.T) {
 	expected.Spec.Template.Spec.Containers[0].ReadinessProbe.Exec.Command[4] = "http://localhost:1111/health"
 	assert.Equal(t, expected, gen.Config["gate"].Deployment)
 }
+
+func TestTransformManifests_CustomServerPortAndHealthEndpoint(t *testing.T) {
+	tr, _ := th.SetupTransformerFromSpinFile(&ServerPortTransformerGenerator{}, "testdata/spinsvc_profile_health_endpoint.yml", t)
+	gen := &generated.SpinnakerGeneratedConfig{}
+	test.AddDeploymentToGenConfig(gen, "gate", "testdata/input_deployment.yml", t)
+
+	err := tr.TransformManifests(context.TODO(), gen)
+	assert.Nil(t, err)
+
+	expected := &v1.Deployment{}
+	test.ReadYamlFile("testdata/input_deployment.yml", expected, t)
+	expected.Spec.Template.Spec.Containers[0].Ports[0].ContainerPort = int32(1111)
+	expected.Spec.Template.Spec.Containers[0].ReadinessProbe.Exec.Command[4] = "http://localhost:1111/api/v1/health"
+	assert.Equal(t, expected, gen.Config["gate"].Deployment)
+}

pkg/deploy/spindeploy/transformer/testdata/spinsvc_profile_health_endpoint.yml

@@ -0,0 +1,23 @@
+apiVersion: spinnaker.io/v1alpha2
+kind: SpinnakerService
+metadata:
+  name: spinnaker
+  namespace: ns1
+spec:
+  spinnakerConfig:
+    config:
+      version: 1.15.1
+      persistentStorage:
+        persistentStoreType: s3
+        s3:
+          bucket: my-bucket
+          region: us-west-2
+          rootFolder: front50
+    profiles:
+      gate:
+        healthEndpoint: /api/v1/health
+        server:
+          port: 1111
+status:
+  apiUrl: http://acme.com
+  uiUrl: http://acme.com