People who use these know what they are doing, for everybody else
this is just plain confusing.

The regdhcp conditional option never really worked in the first place.
Dhcplease registration is controlled by regdhcp and regdhcpstatic
elsewhere already and we always need to include this file.

PR: https://forum.opnsense.org/index.php?topic=4041

Right now, kern.hz is 1000 by default, and, more surprisingly,
net.inet.tcp.rexmit_min is 30 in FreeBSD too...

when ipfw isn't configured, the service won't (re)start throwing an error, use of onestart instead of start fixes this. closes https://github.com/opnsense/core/issues/1292

Save doesn't trigger in dialog yet, though.

(system_general.php) performance issue, lookup_gateway_ip_by_name() is very inefficient, don't try to execute if we know it's not a gateway.....

(filter.inc) generate aliases for internal networks

(interfaces.lib.inc) merge _legacy_getall_interface_addresses() and legacy_interfaces_details() for more consistent ifconfig parsing

This adds the "normal" power state to the powerd - system_advanced_misc options.
If the powerd utillity can not determine the system power options (ac or battery) it will use the "normal" setting rendering the "ac" and "battery" settings useless for these systems.

This is a bit tricky, because there is a bug where UFS labels
disappear.  For now, clobber /etc/fstab to make sure the next
boot goes as planned.

This is an inplace config migration.  The mount still behaves
the same way and a config save from the page migrates the
options.  We're not in a rush here, but the reason is that
we should have clean options and the new 17.1 images for nano
will depend on the new style.