Fix FakeNodeHandler Update behaviour

Two problems:
1. Get is always using Existing nodes slice, and you will for sure miss any
   updated data
2. Each Update duplicates node entry in UpdatedNodes slice

For the 1st, try to find a node in UpdatedNodes slice (same as for the List).
2nd - append only if there is no node with same name as updated, if there is
just replace object.

Change-Id: I9ef1cca2788ba946eee37fa1b037c124ad76074c

pkg/controller/node/test_utils.go

@@ -107,6 +107,12 @@ func (m *FakeNodeHandler) Get(name string) (*api.Node, error) {
 		m.RequestCount++
 		m.lock.Unlock()
 	}()
+	for i := range m.UpdatedNodes {
+		if m.UpdatedNodes[i].Name == name {
+			nodeCopy := *m.UpdatedNodes[i]
+			return &nodeCopy, nil
+		}
+	}
 	for i := range m.Existing {
 		if m.Existing[i].Name == name {
 			nodeCopy := *m.Existing[i]
@@ -169,6 +175,12 @@ func (m *FakeNodeHandler) Update(node *api.Node) (*api.Node, error) {
 		m.lock.Unlock()
 	}()
 	nodeCopy := *node
+	for i, updateNode := range m.UpdatedNodes {
+		if updateNode.Name == nodeCopy.Name {
+			m.UpdatedNodes[i] = &nodeCopy
+			return node, nil
+		}
+	}
 	m.UpdatedNodes = append(m.UpdatedNodes, &nodeCopy)
 	return node, nil
 }