Add 15.10 and remove 15.04 from the build matrix

Change-Id: Ic67bfe7b7d500ebd85952829cc9d4495ac5c3ed4
diff --git a/packaging.mk b/packaging.mk
index 6d34f9f..e293470 100644
--- a/packaging.mk
+++ b/packaging.mk
@@ -2,7 +2,7 @@
 PPA=ppa:named-data/ppa-dev
 
 # List of target distributions
-DISTROS=precise trusty vivid
+DISTROS=precise trusty wily
 
 DEBUILD=debuild -S