Bump version to 1.17.21

debian/changelog

@@ -1,3 +1,9 @@
+dpkg (1.17.21) UNRELEASED; urgency=low
+
+  * 
+
+ -- Guillem Jover <guillem@debian.org>  Thu, 23 Oct 2014 02:12:01 +0200
+
 dpkg (1.17.20) unstable; urgency=low
 
   [ Guillem Jover ]