ACL parser fixers for IPv6 and negated (T)IP object sorting

- Negated IP objects are always < than not negated so we follow Juniper's
  sorting method.
- Re-add of " except" parsing for negated objects.
- Make sure the repr on negated objects displays the prefix before " except"
- Negated IP objects will always be assumed to be used for Juniper ACLs
- Always display the prefix on /32 and /128 IPs in Juniper ACLs