Before, each time a service that use ceilometer.publisher.rpc start this
annoying message appear because the default value is not the correct.
WARNING ceilometer.publisher.rpc [-] Publishing policy is unknown (wait) force to default
WARNING ceilometer.publisher.rpc [-] Publishing policy is unknown (wait) force to default
This patch set the correct default (to default inteads of wait), and check in tests
that the expected logger method is called.
Fixes bug #1245965
Change-Id: I41b9461359c7b0b17eb8e9dad1772bafdc3554fc