Light up UpdatePod (#613)

* Light up UpdatePod

This PR updates the vkublet/pod.go createOrUpdate(..) method to actually handle
updates. It gets the pod from the provider as before, but now if it exists the method
checks the hash of the spec against the spec of the new pod. If they've changed, it
calls UpdatePod(..).

Also makes a small change to the Server struct to swap from kuberentes.Clientset to kubernetes.Interface
to better facilitate testing with fake ClientSet.

Co-Authored-By: Brian Goff <cpuguy83@gmail.com>

providers/mock/mock.go

@@ -71,6 +71,32 @@ func NewMockProvider(providerConfig, nodeName, operatingSystem string, internalI
 	return &provider, nil
 }
 
+// NewMockProviderMockConfig creates a new MockProvider with the given Mock Config
+func NewMockProviderMockConfig(config MockConfig, nodeName, operatingSystem string, internalIP string, daemonEndpointPort int32) (*MockProvider, error) {
+
+	//set defaults
+	if config.CPU == "" {
+		config.CPU = defaultCPUCapacity
+	}
+	if config.Memory == "" {
+		config.Memory = defaultMemoryCapacity
+	}
+	if config.Pods == "" {
+		config.Pods = defaultPodCapacity
+	}
+
+	provider := MockProvider{
+		nodeName:           nodeName,
+		operatingSystem:    operatingSystem,
+		internalIP:         internalIP,
+		daemonEndpointPort: daemonEndpointPort,
+		pods:               make(map[string]*v1.Pod),
+		config:             config,
+		startTime:          time.Now(),
+	}
+	return &provider, nil
+}
+
 // loadConfig loads the given json configuration files.
 
 func loadConfig(providerConfig, nodeName string) (config MockConfig, err error) {