
This patch changes 'image_ref'/'flavor_ref' to 'imageRef'/'flavorRef' that same with v2 api. And also change the related unittest. The differences between v2 and v3 are described on the wiki page https://wiki.openstack.org/wiki/NovaAPIv2tov3. Partially implements blueprint v2-on-v3-api Change-Id: Ic17334e0a9de89488d5e0c8b75950027d51a3cd4