Ceilometer integration

Here is the list of things we need to begin a Ceilometer integration in second iteration.
1. The minimum to start is an Baremetal agent
https://blueprints.launchpad.net/ceilometer/+spec/monitoring-physical-devices
https://blueprints.launchpad.net/ironic/+spec/send-data-to-ceilometer

2. Add the meters that maps the baremetal metrics, like disk health and other hardware related metrics, into Ceilometer (there is no BP for this yet)
Right now Ceilometer supports only this metrics:
http://docs.openstack.org/developer/ceilometer/measurements.html

3. Finish the Ceilometer Enhanced API in horizon (though some of the things could be implemented with normal API now)

4. Showing events of the Ceilometer (need to investigate it further, but this could be the list of events that shows up in wireframes)
https://blueprints.launchpad.net/ceilometer/+spec/specify-event-api

These things will be probably also needed
https://blueprints.launchpad.net/ceilometer/+spec/non-libvirt-hw
https://bugs.launchpad.net/nova/+bug/1188218