rules.pl: Do not check private networks against ipblocklists.

rules.pl: Do not check private networks against ipblocklists.

In case some of these private networks are part of an used blocklist
this kind of traffic needs to be allowed. Otherwise some services may
not work properly.

For example:
In case one ore more IPSec N2N connections are configured no traffic can
be passed through it, if the used networks are part of an blocklist.

Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>