adblock: update 1.1.15

* toggle to quickly switch adblocking 'on' or 'off' (/etc/init.d/adblock
toggle)
* new config option 'fetchttl' to set download timeouts (default: 5
seconds)
* better config check, distinct between major/minor changes
* documentation update

Signed-off-by: Dirk Brenken <dev@brenken.org>
(cherry picked from commit 4f3f239ff2)

net/adblock/files/adblock.conf

@@ -3,10 +3,11 @@
 
 config adblock 'global'
 	option adb_enabled '1'
-	option adb_cfgver '1.3'
+	option adb_cfgver '2.0'
 	option adb_whitelist '/etc/adblock/adblock.whitelist'
 	option adb_whitelist_rset '\$1 ~/^([A-Za-z0-9_-]+\.){1,}[A-Za-z]+/{print tolower(\$1)}'
 	option adb_forcedns '1'
+	option adb_dnstoggle 'on'
 
 config service 'backup'
 	option enabled '0'