Suricata

Some per-thread stat values can be negative, e.g., tcp.active_sessions and flow.active. The summation of all thread values is correct, however.

Negative stat values can be confusing.

We should
- Add a configuration value to control whether an individual thread stat value is displayed when negative
- Display (not display) the value according to the configuration setting.

The default value of the config would be "display all values".