unbound: expand UCI to cover some popular dnsmasq features

Unbound+DHCP (server of your choice) should be able to replicate
a lot of what dnsmasq provides. With this change set Unbound
still works with dnsmasq, but also it can work with a plain
DHCP server. Features have been added within the UCI itself
to act like dnsmasq.

- alone: name each interface relative to router hostname
- alone: prevent upstream leakage of your domain and '.local'
- dnsmasq: use dnsmasq UCI to configure forwarding clauses
- dhcp: work with odhcpd as example of companion DHCP-DNS
- dhcp: convert DHCPv4 leases into EUI64 SLAAC for DNS records
- all: enable encrypted remote unbound-control using splice conf
- all: allow user spliced conf-files for hybrid UCI and manual conf
-- 'unbound_srv.conf' will be spliced into the 'server:' clause
-- 'unbound_ext.conf' will add clauses to the end, example 'forward:'

README HOW TO for dnsmasq-in-serial, dnsmasq-in-parallel, and
unbound-with-odhcpd have better/added UCI starters. HOW TO for
including unbound_srv.conf and unbound_ext.conf are added.
Document new UCI: add_local_fqdn, add_wan_fqdn, dhcp4_slaac6,
dhcp_link, domain, and domain_type

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

net/unbound/files/unbound.uci

@@ -1,9 +1,12 @@
 config unbound
+	option add_local_fqdn '1'
+	option add_wan_fqdn '0'
+	option dhcp_link 'none'
+	option dhcp4_slaac6 '0'
 	option dns64 '0'
 	option dns64_prefix '64:ff9b::/96'
-	option dnsmasq_gate_name '0'
-	option dnsmasq_link_dns '0'
-	option dnsmasq_only_local '0'
+	option domain 'lan'
+	option domain_type 'static'
 	option edns_size '1280'
 	option hide_binddata '1'
 	option listen_port '53'