Also added better support to webserver plugin to load statistics
pages if statistics is plugin is loaded.

It could be we have multiple remove events queued, this is mostly
the case if we do a full reload from file and we populate very
many events with IP conflicts at once.

* Support for interface groups
* Support for class CIR/Limit per interface
* Match priority support
* Totally dynamic TC class support per interface
* Totally dynamic TC filter support per interface per match priority
* Interface statistics support

The only supported DB at this time is MySQL/MariaDB