Limit packaging to 14.04 and 16.04

Change-Id: Ie7a83b009536f3978e98a4454b685c5a833c395b
diff --git a/packaging.mk b/packaging.mk
index bac3a17..987f78b 100644
--- a/packaging.mk
+++ b/packaging.mk
@@ -2,7 +2,7 @@
 PPA=ppa:named-data/ppa-dev
 
 # List of target distributions
-DISTROS=precise trusty wily xenial
+DISTROS=trusty xenial
 
 DEBUILD=debuild -S