stubby: Restart on interface trigger

Cherry-picked from commit 3c04a6d235.

Force restart stubby if any of the trigger interfaces goes up or down. Avoids DoT DNS lookup timeouts when default route changes, in case of multiple
upstream interfaces.

Signed-off-by: Aquila Cooper <aquila@cpr.is>

net/stubby/files/stubby.init

@@ -270,7 +270,7 @@ service_triggers()
 
     for trigger_item in $trigger
     do
-        procd_add_interface_trigger "interface.*.up" "$trigger_item" "$stubby_init" start
+        procd_add_interface_trigger "interface.*" "$trigger_item" "$stubby_init" restart
     done
 
     procd_add_reload_trigger "stubby"