Expose more data into our nodepool grafana dashboard showing the break
down of which images (labels) are being build / ready / inuse / delete
state.
This can be helpfully to see the type of nodes we are running.
Change-Id: I30929c2b478d6a67111d1b52d1b4103434b43732
Signed-off-by: Paul Belanger <pabelanger@redhat.com>