[identity] Add delete_tenant request
[identity] Add update_tenant request
[identity] Add add_role_to_user_on_tenant request
[identity] Add delete_role_from_user_on_tenant request
[identity] Optimize url concatenation on add_role_to_user_on_tenant request
[identity] Add comments on hardcoded ids
Merge pull request #45 from alvingarcia/feature/33

[identity] Tenant operations