specs-go: tag device 'NameShort' with 'omitempty'.

The existing code does not use device short names, so maybe they
could/should be removed altogether. Ditto for 'Spec.KindShort'...

Signed-off-by: Krisztian Litkey <krisztian.litkey@intel.com>

specs-go/config.go

@@ -16,7 +16,7 @@ type Spec struct {
 // Device is a "Device" a container runtime can add to a container
 type Device struct {
 	Name           string         `json:"name"`
-	NameShort      []string       `json:"nameShort"`
+	NameShort      []string       `json:"nameShort,omitempty"`
 	ContainerEdits ContainerEdits `json:"containerEdits"`
 }