cinder.py from monitoring-for-openstack does not work on kilo

[VIncent S. Cojot]

/usr/bin/oschecks-check_cinder_api reports a 403 when used against OSP7.
It is because we are calling the cinder API with a tenant name instead of a tenant id to list the quotas.

1) More output information:

When running this:
/usr/bin/oschecks-check_cinder_api --os-username sensu --os-password sensu --os-tenant-name monitoring --os-auth-url http://192.168.1.7:5000/v2.0
[...]
Forbidden: Access was denied to this resource. (HTTP 403) (Request-ID: req-be899553-d341-4911-b6ce-f9e01cd9498c)

I think the issue comes from this line:
https://github.com/openstack/osops-tools-monitoring/blob/master/monitoring-for-openstack/oschecks/cinder.py#L42

instead of doing this:
 return client.quotas.get(options.os_tenant_name)
something like this would be needed:
 return client.quotas.get(options.os_tenant_id)

unfortunately, options.os_tenant_id isn't populated by the current code.