NAC, ndn-traffic-generator, ndncert, repo-ng: Update to the latest versions

Change-Id: I41dedf689e1c4060021c6a01e86bf3f652e96dbe
diff --git a/ndncert/Makefile b/ndncert/Makefile
index 69db0aa..f16548f 100644
--- a/ndncert/Makefile
+++ b/ndncert/Makefile
@@ -2,13 +2,13 @@
 GIT_URL=https://github.com/named-data/ndncert
 
 # Tag name or commit hash for checkout
-GIT_VERSION=fae76c4dc736b0252e4503ef76c8738afce1d571
+GIT_VERSION=3e4818421a606c46614e25e66296c6e1a0761a75
 
 # Package name
 NAME=ndncert
 
 # Package version
-VERSION=0.0.5-1-gfae76c4dc
+VERSION=0.0.6-1-g3e4818421
 
 # PPA version
 PPA_VERSION=1