adblock-fast: initial commit

* this package replaces simple-adblock package
* it was impossible to keep existing config structure and continue
  improving the simple-adblock the way I wanted, hence the new
  package name
* the migration script for existing simple-adblock config is included in
  the uci-defaults file

Signed-off-by: Stan Grishin <stangri@melmac.ca>

net/adblock-fast/test.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+/etc/init.d/"$1" version 2>&1 | grep "$2"