Complete Image v1

* Add v1 versions of image delete, list, save, set, show
* Change default Image API to v1

Rebased for https://review.openstack.org/#/c/36772/

Change-Id: Ie2bfe660aac8a0fcf651c67fd1ea4842e76ce377
Merge branch 'identity-catalog' into dt-test
Merge branch 'limits-show' into dt-test
Merge branch 'volume-keystone' into dt-test