adblock: update 1.5.0

* add new 'envchk'function to check adblock environment only,
  i.e. check volatile firewall rules or uhttpd instances
  without list updates
* add new optional parm 'adb_loglevel',
  set it to "0" to mute output (print only errors)
* set hotplug priority to '90' as well (missed in the last commit)
* documentation update
* cosmetics

Signed-off-by: Dirk Brenken <dev@brenken.org>

net/adblock/files/adblock.init

@@ -2,10 +2,11 @@
 #
 
 START=90
-EXTRA_COMMANDS="toggle stats cfgup query"
+EXTRA_COMMANDS="toggle stats cfgup envchk query"
 EXTRA_HELP="	toggle	Toggle adblock 'on' or 'off'
 	stats	Update adblock statistics
 	cfgup	Update adblock configuration file
+	envchk	Check/Set adblock environment
 	query	<DOMAIN> Query active blocklists for specific domain"
 
 adb_debug=0
@@ -159,3 +160,14 @@ query()
     fi
     return 0
 }
+
+envchk()
+{
+    adb_loglevel=0
+    f_envcheck
+    rm -f "${adb_tmpfile}"
+    rm -rf "${adb_tmpdir}"
+    adb_loglevel=1
+    f_log "adblock environment check finished successfully"
+    return 0
+}