Update RabbitMQ dashboard.
Update RabbitMQ dashboard.

- Removed templating.
- Removed metrics about main process.
- Renamed memory panel and added metrics about avg, min and max.
- Added min and max to Read/Unack messages.

Change-Id: I3f2651f75995e274e6d51e01162b2057b1275014

stackforge/fuel-plugin-influxdb-grafana,stackforge/fuel-plugin-influxdb-grafana,stackforge/fuel-plugin-influxdb-grafana,stackforge/fuel-plugin-influxdb-grafana