Service Scan does not take firewall into account.

[nguyen-thanh20]

When a service scan action is executed on a host from a different subnet, the firewall between these subnets cannot filter the allowed services. For example, in a medium scenario, when host (3,1) performs a service scan on host (5,0), the samba service can still be detected even though the firewall only allows ssh and ftp services between subnet 3 and 5.

I had fix version in my side. If it acceptable, I can create a pull request.