Add nftables::simplerule
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`...
Merge pull request #22 from cernops/log_limit
Set a customisable rate limit to the logging rules
Allow disabling default NAT tables and chains
Add support for named sets
