Switch all referencs to image.ContainerConfig to image.Config

This will more closely match what Docker is doing.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

libpod/container_internal_test.go

@@ -28,7 +28,7 @@ func TestPostDeleteHooks(t *testing.T) {
 	statePath := filepath.Join(dir, "state")
 	copyPath := filepath.Join(dir, "copy")
 	c := Container{
-		config: &ContainerConfig{
+		config: &Config{
 			ID: "123abc",
 			Spec: &rspec.Spec{
 				Annotations: map[string]string{