vrouter: remove a POSTROUTING rule for port forwarding in VPC router (#3952)
vrouter: remove a POSTROUTING rule for port forwarding in VPC router (#3952)

As discussed in #3937 (comment)
a rule for port forwarding in VPC router might not be needed.

This fixes the failed result of health check for network VRs.
GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack