[PATCH] Don't treat 0/8 and 240/4 specially in IPv4 classification

[Chriztoffer]

On Tue, 22 Nov 2022 at 20:42, Ross Tajvar via Bird-users
<bird-users at trubka.network.cz> wrote:
>
> As an operator, I would be frustrated if I spent a while trying to get 0/8 or 240/4 to work, only to discover that I needed to use a special config directive to "enable" those prefixes. My preference would be to include them in a default-config bogons list.

A middle ground could be to in the 2.X releases to use the current
behaviour (default inclusion in the bogons, enable 0/8 and 240/4 to
work using a config directive.

*Then* in the 3.X releases, switch the behaviour (major behaviour
change) to defaulting to omtting 0/8 and 240/4 from the default
hard-coded bogons. Re-add the networks to the default (built-in)
bogons list using a config directive.