Implement a generic notification plugin for hardware sensor meters

The exists an IPMI centric hardware sensor meter notification plugin which supports creation of a fixed set of meters for event type 'hardware.ipmi.*' . This current notification plugin cannot be used by any sensor meter producer other than IPMI. The current sensor notification plugin strategy appears to require the creation of a notification plugin per sensor producer. I would like to propose a generic hardware sensor plugin that could be used by multiple sensor producers to create a consistent set of sensor metrics in ceilometer.

This blueprint is for the creation of a single notification plugin which would support meter creation for a notification message defined set of meters received from 'ironic' for event type 'hardware.sensors'. The actual meter s created by this plugin will be strictly based upon a fixed set of fields which must be present in the received message payload. Having a single generic notification plugin for all sensor meters will ensure consistency of customer access to all sensor meters regardless of the driver in 'ironic' which produces the sensors.