Rename Service to Endpoint (#192)

* Add clarifications in comments

* #191: Rename Service to Endpoint

core/endpoint_status_test.go

@@ -0,0 +1,19 @@
+package core
+
+import (
+	"testing"
+)
+
+func TestNewEndpointStatus(t *testing.T) {
+	endpoint := &Endpoint{Name: "name", Group: "group"}
+	status := NewEndpointStatus(endpoint.Group, endpoint.Name)
+	if status.Name != endpoint.Name {
+		t.Errorf("expected %s, got %s", endpoint.Name, status.Name)
+	}
+	if status.Group != endpoint.Group {
+		t.Errorf("expected %s, got %s", endpoint.Group, status.Group)
+	}
+	if status.Key != "group_name" {
+		t.Errorf("expected %s, got %s", "group_name", status.Key)
+	}
+}