Rename nftables_configuration_path to configuration_path
Convert puppet_nft systemd drop-in unit file to template
Remove duplicate flush on reload
When nftables was reloaded a flush was being done both in the systemdreload call and in the nft script itself.
New parameter noflush_tables to selectivly skip flush
Introduces a new structured fact nftables
```yamlnftables: tables: - inet-filter - ip-nat - ip6-nat - inet-f2b-table```
By default the nft script will continue to contain `nft flush ruleset`...
