Dump the MACs
Alter output to match maint_mac_db
Only output interfaces that are dhcp_enabled
Refactor some logic, alter output to match radius-report more closely.
Small refactor using itertools
Refactor logic to be a bit cleaner
Refactor some logic. Forbidden MAC's are now in the used MAC's set instead of a
separate set. A bug where disabled interfaces still "used" their MAC's is now
fixed.
Remove pointless More_than_90_days thing
Merge pull request #718 from zeeman/mac_dump_management_command

Add management command to dump all MAC's