Merge branch 'topic/fix-nfdump'

* topic/fix-nfdump:
  install the latest nfdump to make tests happy

.ci/install-nfdump.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+set -ex
+
+VER=1.6.16
+DEST=$HOME/.sources/nfdump-${VER}.tar.gz
+
+mkdir -p $HOME/.sources
+
+if ! [ -e $DEST ] ; then
+	curl -Lo $DEST https://github.com/phaag/nfdump/archive/v${VER}.tar.gz
+fi
+
+tar xvzf $DEST
+cd nfdump-$VER
+./configure --prefix=$HOME/local && make && make install
+$HOME/local/bin/nfdump -V

.travis.yml

@@ -5,7 +5,20 @@ go:
   - "1.10"
   - tip
 
+cache:
+  directories:
+  - $HOME/.sources
+
 addons:
   apt:
     packages:
-      - nfdump
+      - flex
+      - bison
+      - libbz2-dev
+      - liblzo2-dev
+
+before_install:
+  - ./.ci/install-nfdump.sh
+
+before_script:
+  - export PATH=$PATH:$HOME/local/bin