Move upload/download image action to right place

test_update_image is used to test image update API, it's quite
confusing that the upload/download image API is called.

And there is the test for upload/download image API already:
test_register_upload_get_image_file

We should move the upload/download action to the right place.

Change-Id: I18e13cdb81c5ec3fc4abcdd8c8fb21eaf05d4675
1 file changed