add vendoring with go dep

vendor/github.com/vmware/govmomi/govc/test/images/.gitignore

@@ -0,0 +1,3 @@
+ttylinux-*
+floppybird.img
+

vendor/github.com/vmware/govmomi/govc/test/images/update.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+pushd $(dirname $0)
+
+# Sadly, the ttylinux project was abandoned in late 2015.
+# But this release still serves us well.
+base_url=http://dl.bintray.com/dougm/ttylinux
+ttylinux="ttylinux-pc_i486-16.1"
+files="${ttylinux}.iso ${ttylinux}-live.ova ${ttylinux}.ova"
+
+for name in $files ; do
+  wget -qO $name $base_url/$name
+done
+
+wget -qN https://github.com/icebreaker/floppybird/raw/master/build/floppybird.img
+
+# extract ova so we can also use the .vmdk and .ovf files directly
+tar -xvf ${ttylinux}.ova
+
+popd