Description of metering agent configuration options

Configuration option = Default value	Description
[DEFAULT]
driver = neutron.services.metering.drivers.noop.noop_driver.NoopMeteringDriver	(StrOpt) Metering driver
measure_interval = 30	(IntOpt) Interval between two metering measures
[AGENT]
report_interval = 30	(FloatOpt) Seconds between nodes reporting state to server; should be less than agent_down_time, best if it is half or less than agent_down_time.