puppet nftables

rubocop:auto_correct results

support a different table name for 'nat'
- Some applications (such as libvirt) still use iptables to inject firewall
rules
- iptables will refuse to update tables that were initially created with nft
- This commit allows defining the name of the 'nat' table in order to avoid...

Fix IPv4 source address type detection

Before this patch, a rule like this:

```
nftables::simplerule { 'foo':
action => 'accept',
dport => 443,
proto => 'tcp4',
saddr => '192.168.1.10',
}
```

would incorrectly generate this rule:...

Fix IP version filter for IPv6 traffic

Prefix custom tables with custom- so they're loaded