Resource manager: add service lister and remove unused lock. (#559)

* Remove unused lock from the resource manager.

* Add service lister to the resource manager.

This change adds a service lister in the
resource manager.
This will be used to set the service env vars.
Also added a List method to the resource manager
and a simple test to confirm it's a pass through.

test/util/kubernetes.go

@@ -54,3 +54,13 @@ func FakeSecret(namespace, name string, data map[string]string) *corev1.Secret {
 	}
 	return res
 }
+
+// FakeService returns a service with the specified namespace and name.
+func FakeService(namespace, name string) *corev1.Service {
+	return &corev1.Service{
+		ObjectMeta: metav1.ObjectMeta{
+			Namespace: namespace,
+			Name:      name,
+		},
+	}
+}