Turns out unbound reload flushes cache as well.  Also, unbound-control
may hang when it runs into an "undefined state" (stoping a stopped
service, right), and lastly it wants to chroot after being chrooted
on reload, something that cannot be fixed with using unbound-control.

Keep unbound-control-setup in case somebody finds the facility useful.

Firmware MVC pages were introduced in 2015, since having been worked
on by Deciso and myself.

IPFW and PF are used for more than just firewall and shaper, e.g.
NAT, policy routing or shaping, and the plugin framework supports
registering multiple user-facing services per file.

pkg can display to-be-deleted packages, but won't resolve these
issues when triggered using "upgrade -n".  Thus, it's pointless
to try to keep this code until a newer pkg release can actually
cope with resolving the full upgrade cycle before upgrading.

This is the glue needed to be entirely plugin-agnostic, it only
needs new hooks for spots we haven't pluginified yet.  The dns
subsystem is another likely candidate in the long run.

Allows to move these plugins away from core: bsnmpd, igmpproxy,
relayd, miniupnpd.  ACL and menu entries pending...

.. with either IGMP or FTP proxy.