change: use image_uris.retrieve instead of fw_utils.create_image_uri for DLC frameworks#1724

laurenyu merged 2 commits intoaws:zweiaws/sagemaker-python-sdk:zweifrom

laurenyu:rm-fw-from-create-image-urilaurenyu/sagemaker-python-sdk:rm-fw-from-create-image-uriCopy head branch name to clipboard