[backfire] merge r23256, r23257 and r23258

git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@23295 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/files/sbin/sysupgrade

@@ -51,8 +51,9 @@ EOF
 
 add_uci_conffiles() {
 	local file="$1"
-	( find /etc/config /etc/passwd /etc/group /etc/dropbear \
-		/etc/firewall.user /etc/rc.local -type f;
+	( find $(sed -ne '/^[[:space:]]*$/d; /^#/d; p' \
+		/etc/sysupgrade.conf /lib/upgrade/keep.d/* 2>/dev/null) \
+		-type f 2>/dev/null;
 	  opkg list-changed-conffiles ) | sort -u > "$file"
 	return 0
 }