extend `pmgdb dump`

extend `pmgdb dump`

add priority, direction and an active flag to `pmgdb dump` output.

pmgdb dump provides the complete ruleset including all rules and related
objects. The information whether a rule is active and in which direction it
works is necessary to get an overview about the setup for pmg-smtp-filter.

Additionally the priority was explicitly added to the output for easier matching
with the GUI.

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>