[identity][v3/regions] Types of some parameters are wrong
[identity][v3/regions] Types of some parameters are wrong

Changing type of:
- "regions" from "xsd:string" to "xsd:list"
- "region" from "xsd:string" to "xsd:dict"

Change-Id: Ibef126ea83ddfb45240a0fef28f74a671e1f8820
Closes-Bug: #1547358

openstack/api-site,openstack/api-site,Tesora/tesora-api-site,openstack/api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,openstack/api-site