Change job count aggregation metric name

[retzkek]

The base job count metric is named count, which in the default graphite/carbon config is set to a sum aggregation rather than average, which is required. Since other sources (e.g. Grafana) may expect the default configuration, changing the graphite config is not a great solution, nor is putting in a fifemon-specific aggregation.

The best solution is likely to change the metric name, maybe count_total?