Add the ability to set firewall rules for custom CIDR ranges

[laszlojau]

In the current implementation, the CIDR ranges set in the firewall rules are hard-coded: 10.42.0.0/16 and 10.43.0.0/16.
Users are able to override these CIDR ranges via the cluster-cidr and service-cidr flags/variables but this does not update the ranges used for the firewall rules.