Avoid weird typecasting

In test_list_usage_all_tenants, the detailed parameter of
list_tenant_usages API should be "1" because Nova handles "1"
as True with:
https://github.com/openstack/nova/blob/master/nova/api/openstack/compute/plugins/v3/simple_tenant_usage.py#L218
  detailed = env.get('detailed', ['0'])[0] == '1'

Change-Id: I350e8cd44cc22fbf6034462ce4ea7d26eeb28cae
2 files changed