This goes for the normal firewall, the egress firewall and the network
ACL.
USE WITH CAUTION! When setting `managed = true` in your config, it
means it will delete all firewall rules that are not in your config, so
unknown to TF.
Also adding the new `cloudstack_egress_firewall` resource with this
commit and updating go-cloudstack to the latest API version (v4.4)
Of course not all resources are covered by this first release, but
there should be enough resources available to handle most common
operations.
Tests and docs are included.
