nwfilter: changes to rules in VM->host table
nwfilter: changes to rules in VM->host table

In the table built for traffic coming from the VM going to the host make the following changes:

- don't ACCEPT the packets but do a 'RETURN' and let the host-specific firewall rules in subsequent rules evaluate whether the traffic is allowed to enter

- use the '-m state' in the rules as everywhere else

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