DNS flag day 2020, software should reflect the minimum EDNS 1232 bytes.
Added iface_wan and iface_lan to control internal DNS assignemnts and
to control what is local service ACL. Interface wild cards are not
explicitly set so that they can be customized in extended conf.

Signed-off-by: Eric Luehrsen <ericluehrsen@gmail.com>

With growing interest, DNS over TLS can be setup in Unbounds foward-zone:
clause. A broader UCI solution is added to support forward-, stub-, and
auth- zone clauses in a new 'zone' section. This implentation required
reworking scripts, because they did not scale. 'forward_domain' and
'prefetch_root' options are removed, and superceded by 'zone' section.

Signed-off-by: Eric Luehrsen <ericluehrsen@gmail.com>

procd interface triggers may be busy. Unbound hard restarts will
flush the cache. This might happen frequently depending on how
interface triggers occur.

Change the procd trigger to reduce occurences. Load this trigger
prior to netifd (START=20), but only truly start Unbound from
the trigger rather than immediately in init. Clean up log entries
in scripts after Unbound, NTP, and DNSSEC are established.

Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>

If Unbound was disabled and at later time enabled, then it
would operate in DNSSEC less-secure mode. When NTP hotplug
was called, the timestamp file was not updated. This was
found testing Unbound vs other tools (bind, dnsmasq).

Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>

- UCI option dnsmasq_gate_name typo in few locations
- NTP hotplug to check /etc/init.d/unbound not ..dnsmasq

Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>

-DNSSEC needs time, time needs ntp, or power off RTC
-Many consumer routers are cost thrifted without RTC
-Conf "val-override-date: -1" disables time inside DNSSEC
-Need restart as option is not dynamically switchable
-hotplug/ntp is used to set file /var/lib/unbound/unbound.time
-UCI will add or remove option depending on flag-like-file

Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>

-Rebind to new interfaces cleanly
-Detach from old interfaces cleanly
-Some conf options do not reload dynamically
-Unbound grows some and this will shrink it

Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>