Changes required to have v3 plugin natively support the V2.1
API.
The parameters admin_password and image_ref were reverted to
adminPass and rescue_image_ref
Partially implements blueprint v2-on-v3-api
Co-Authored-By: Chris Yeoh <cyeoh@au1.ibm.com>
Change-Id: Ibca991b5d6ec065ea9fbb0318c4ab51a3c5a3eba