Do not automatically decode runtime.RawExtension

Make clients opt in to decoding objects that are stored
in the generic api.List object by invoking runtime.DecodeList()
with a set of schemes. Makes it easier to handle unknown
schema objects because decoding is in the control of the code.

Add runtime.Unstructured, which is a simple in memory
representation of an external object.

pkg/namespace/namespace_controller_test.go

@@ -135,7 +135,7 @@ func TestSyncNamespaceThatIsActive(t *testing.T) {
 }
 
 func TestRunStop(t *testing.T) {
-	o := testclient.NewObjects(api.Scheme)
+	o := testclient.NewObjects(api.Scheme, api.Scheme)
 	client := &testclient.Fake{ReactFn: testclient.ObjectReaction(o, latest.RESTMapper)}
 	nsMgr := NewNamespaceManager(client, 1*time.Second)