implement expose service, add tests, fix #140

Implements a kompose specific docker compose label "kompose.service.expose" which can be used to expose the specified services externally. The accepted values are of type string.
If the value is set to "true", the provider sets the endpoint automatically, and for any other value, the value is set as the hostname. If multiple ports are defined in a service, the first one is chosen to be the exposed.

Unit tests, functional tests, glide updates and docs have also been added in this commit for the related feature.

pkg/transformer/kubernetes/kubernetes.go

@@ -201,6 +201,45 @@ func (k *Kubernetes) InitDS(name string, service kobject.ServiceConfig) *extensi
 	return ds
 }
 
+func (k *Kubernetes) initIngress(name string, service kobject.ServiceConfig, port int32) *extensions.Ingress {
+
+	ingress := &extensions.Ingress{
+		TypeMeta: unversioned.TypeMeta{
+			Kind:       "Ingress",
+			APIVersion: "extensions/v1beta1",
+		},
+		ObjectMeta: api.ObjectMeta{
+			Name: name,
+		},
+		Spec: extensions.IngressSpec{
+			Rules: []extensions.IngressRule{
+				{
+					IngressRuleValue: extensions.IngressRuleValue{
+						HTTP: &extensions.HTTPIngressRuleValue{
+							Paths: []extensions.HTTPIngressPath{
+								{
+									Backend: extensions.IngressBackend{
+										ServiceName: name,
+										ServicePort: intstr.IntOrString{
+											IntVal: port,
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	if service.ExposeService != "true" {
+		ingress.Spec.Rules[0].Host = service.ExposeService
+	}
+
+	return ingress
+}
+
 // Initialize PersistentVolumeClaim
 func (k *Kubernetes) CreatePVC(name string, mode string) *api.PersistentVolumeClaim {
 	size, err := resource.ParseQuantity("100Mi")
@@ -429,6 +468,10 @@ func (k *Kubernetes) Transform(komposeObject kobject.KomposeObject, opt kobject.
 			if k.PortsExist(name, service) {
 				svc := k.CreateService(name, service, objects)
 				objects = append(objects, svc)
+
+				if service.ExposeService != "" {
+					objects = append(objects, k.initIngress(name, service, svc.Spec.Ports[0].Port))
+				}
 			}
 		}
 
@@ -527,6 +570,12 @@ func (k *Kubernetes) Deploy(komposeObject kobject.KomposeObject, opt kobject.Con
 				return err
 			}
 			logrus.Infof("Successfully created PersistentVolumeClaim: %s", t.Name)
+		case *extensions.Ingress:
+			_, err := client.Ingress(namespace).Create(t)
+			if err != nil {
+				return err
+			}
+			logrus.Infof("Successfully created Ingress: %s", t.Name)
 		}
 	}
 
@@ -585,8 +634,21 @@ func (k *Kubernetes) Undeploy(komposeObject kobject.KomposeObject, opt kobject.C
 			} else {
 				logrus.Infof("Successfully deleted PersistentVolumeClaim: %s", t.Name)
 			}
+		case *extensions.Ingress:
+			// delete ingress
+			ingDeleteOptions := &api.DeleteOptions{
+				TypeMeta: unversioned.TypeMeta{
+					Kind:       "Ingress",
+					APIVersion: "extensions/v1beta1",
+				},
+			}
+			err = client.Ingress(namespace).Delete(t.Name, ingDeleteOptions)
+			if err != nil {
+				return err
+			} else {
+				logrus.Infof("Successfully deleted Ingress: %s", t.Name)
+			}
 		}
-
 	}
 	return nil
 }