CRUD statistics panels

Grafana revisions: InfluxDB revision 10, Prometheus revision 11

Added

• Panels and alerts for CRUD module statistics
  To enable CRUD statistics integrated with metrics with quantiles, call

  crud.cfg{
      stats = true,
      stats_driver = 'metrics',
      stats_quantiles = true
  }

  for CRUD 0.11.1 or newer.

Changed

• Set default InfluxDB policy to autogen