can not find private flavor

[jianyu li]

when flavor is private, ceilometer fail to find flavor id. log error as below

ERROR ceilometer.publisher.gnocchi [-] Error creating resource 6743c61e-e93d-4bdb-a3f7-4c663d8f7f70: Invalid input: required key not provided @ data[u'flavor_id'] (HTTP 400): BadRequest: Invalid input: required key not provided @ data[u'flavor_id'] (HTTP 400)

In our environment, I can fix it as below

ceilometer/compute/discovery.py
132c132
< return self.nova_cli.nova_client.flavors.find(name=name).id
---
> return self.nova_cli.nova_client.flavors.find(name=name,is_public=None).id