Setting port forwarding rules opens up firewall to 0.0.0.0/0

[miguelaferreira]

By default, setting a port forwarding rule for a created VM will open up the firewall to 0.0.0.0/0.
This is actually the default behaviour in the Cloudstack API call (https://cloudstack.apache.org/docs/api/apidocs-4.5/user/createPortForwardingRule.html)

This can be a problem when using public IPs, therefore ti would be good to have the option to disable opening up the firewall.