Set cinder_service_region to service_region by default
Set cinder_service_region to service_region by default

This patch ensures that cinder_service_region is set to the value of
service_region in the same way as is done for the other services.

Change-Id: Id211c49a3cbb7a09aea667b310cc2ccb9a9f46e7
Closes-Bug: #1503151
(cherry picked from commit 6a4ef22a0c96c903f5583a15f27071a0e8839e32)

yanyao/openstack-deployment,VaneCloud/openstack-ansible,yanyao/openstack-deployment,yanyao/openstack-deployment,VaneCloud/openstack-ansible,yanyao/openstack-deployment,VaneCloud/openstack-ansible