signing: remove unatteded build key and use current keyring instead

Remove the public unatteded buildkey from the opkg package to avoid
having hardcoded keys in tree. Use the external keyring package instead
which can be easily updated by users.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

package/base-files/files/etc/opkg/keys/b5043e70f9a75cde

@@ -1,2 +0,0 @@
-untrusted comment: LEDE usign key for unattended build jobs
-RWS1BD5w+adc3j2Hqg9+b66CvLR7NlHbsj7wjNVj0XGt/othDgIAOJS+

package/system/lede-keyring/Makefile

@@ -1,17 +1,16 @@
-# Copyright (C) 2009-2012 OpenWrt.org
-# All rights reserved.
+# Copyright (C) 2016 LEDE project
 
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=lede-keyring
-PKG_VERSION:=2016-04-27
+PKG_VERSION:=2016-04-30
 
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(LEDE_GIT)/keyring.git
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=deb70780cc8aea8258db16af4dbebf4d8dcc7a7c
+PKG_SOURCE_VERSION:=5c7857eed3fa06a9005f96b9b029388c7f316e83
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 
 PKG_MAINTAINER:=John Crispin <blogic@openwrt.org>