Implement group resource (#181)

This change implements a new group resource. 

It also sets the standard for a resource reference will be done through
out the controller. A resource reference can either be done by ID or as
a local named reference to the actual resource. This allows end users to
chose if they want to manage things completely in the cluster or not.

Part of #172

Signed-off-by: Philip Laine <philip.laine@gmail.com>

internal/controller/setupkey_controller_test.go

@@ -27,7 +27,6 @@ var _ = Describe("SetupKey Controller", func() {
 		ctx := context.Background()
 
 		r := rand.New(rand.NewSource(GinkgoRandomSeed()))
-
 		setupKeyStore := map[string]*api.SetupKey{}
 		mux := &http.ServeMux{}
 		mux.HandleFunc("/api/setup-keys", func(rw http.ResponseWriter, req *http.Request) {