add MediaType to VirtualMedia (#274)

Co-authored-by: Maksim Kovshov <m.kovshov@yadro.com>

redfish/virtualmedia.go

@@ -105,6 +105,8 @@ type VirtualMedia struct {
 	// MediaTypes shall be the supported media
 	// types for this connection.
 	MediaTypes []VirtualMediaType
+	// Indicates which MediaTypes is used
+	MediaType string
 	// Password shall represent the password to access the
 	// Image parameter-specified URI. The value shall be null in responses.
 	Password string

redfish/virtualmedia_test.go

@@ -31,6 +31,7 @@ var vmBody = `{
 	"Image": "https://example.com/mygoldimage.iso",
 	"ImageName": "mygoldimage.iso",
 	"Inserted": false,
+	"MediaType": "USBStick",
 	"MediaTypes": [
 	  "Floppy",
 	  "USBStick"
@@ -97,6 +98,9 @@ func TestVirtualMedia(t *testing.T) {
 	if result.SupportsMediaInsert == false {
 		t.Error("Expected SupportsMediaInsert to be true since target is set")
 	}
+	if result.MediaType != "USBStick" {
+		t.Errorf("Received invalid MediaType: %s", result.MediaType)
+	}
 }
 
 // TestVirtualMediaUpdate tests the Update call.