Hi there

I recently upgraded my self-hosted controller to 6.1-beta (I'm totally aware it's not a stable release yet) and found a weird and critital bug. When creating IP Group it's impossible to use a valid CIRD: 0.0.0.0/0 (which is by the way used in a default `IPGroup_Any` IP Group without issue - why can't I create a custom IP-Port Group using the same CIDR?). It's critical from an ACL standpoint since it's impossible to create a "deny all outgoing connections to destination port 8080" for example otherwise. Please, address this issue. We have been waiting for Gateway ACL supporting IP Groups a very long time and now this...