unbound: improve startup and dhcp script robustness

- prevent rapid overlap in DHCP script updates
- check and allow localhost forwards with specific applications
- add option for rate limiting inbound queries
- change UCI list to table format with Unbound conf references

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

net/unbound/files/unbound.init

@@ -67,14 +67,13 @@ service_triggers() {
     procd_add_raw_trigger "interface.*.up" 3000 /etc/init.d/unbound restart
 
   elif [ -n "$triggers" ] ; then
-    procd_add_reload_trigger "unbound" "dhcp"
-
-
     for trigger in $triggers ; do
       # User selected triggers to restart at any other time
       procd_add_reload_interface_trigger "$trigger"
     done
 
+    procd_add_reload_trigger "unbound" "dhcp"
+
   else
     procd_add_reload_trigger "unbound" "dhcp"
   fi