BUG12301: Iptables “host/network ‘none’ not found”

BUG12301: Iptables “host/network ‘none’ not found”

Fixes: #12301
When using hosts with MAC-addresses in a hostgroup,
the rule won't be generated if those hosts are selected as target.
There is a hint but due to a wrong hashparameter the hint was not shown.

With this patch the hint is shown again.
Additionally the rule is skipped when rules.pl creates rules.

There are no bootmessages with failed target "none" anymore.
Acked-by: Stefan Schantl <stefan.schantl@ipfire.org>