Add test to make sure duplicate existing rules get purged

Signed-off-by: Ken Barber <ken@bob.sh>
(#15702) firewall duplicated rules are not removed

This fix makes sure that every rule has a different name so same rules
get deleted.
Add counter to a base number for order gen

Signed-off-by: Ken Barber <ken@bob.sh>
Merge pull request #166 from kbarber/duplicate_existing_rules_dont_purge

Duplicate existing rules dont purge