unbound: provide transparent defaults with documentation

Some resource options bundled many Unbound.conf options and
made customizing on top of UCI difficult. Make it easier to
use Unbound built defaults (blank conf sections).

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

net/unbound/files/unbound.uci

@@ -15,13 +15,13 @@ config unbound
 	option listen_port '53'
 	option localservice '1'
 	option manual_conf '0'
-	option protocol 'mixed'
+	option protocol 'default'
 	option query_minimize '0'
 	option query_min_strict '0'
 	option rebind_localhost '0'
 	option rebind_protection '1'
-	option recursion 'passive'
-	option resource 'small'
+	option recursion 'default'
+	option resource 'default'
 	option root_age '9'
 	option ttl_min '120'
 	option unbound_control '0'