port test_simple_tenant_usage into nova v3 part2

this port test_simple_tenant_usage into nova v3 and
corresponding tenant_usages_client

Partially implements blueprint nova-v3-api-tests

Change-Id: Icd50382f6250cb95fab7a9923dc59ed6dd4f278b
Merge "port test_simple_tenant_usage into nova v3 part2"