Multiply updates

  * Add simple post-processor,
    for predictable qemu artifact naming
  * install-recommends false for ubuntu16
  * Fix zerofree for lvm based

Change-Id: Ic87d0c5e9472894714294a27d4aef797474138c6
diff --git a/ubuntu-16.04/run.example.sh b/ubuntu-16.04/run.example.sh
index 2ed17e0..7341ce7 100755
--- a/ubuntu-16.04/run.example.sh
+++ b/ubuntu-16.04/run.example.sh
@@ -25,6 +25,6 @@
 [ -f config-drive/cloudata.iso ] && rm -v config-drive/cloudata.iso
 mkisofs -o config-drive/cloudata.iso -V cidata -r -J --quiet config-drive
 # For qemu test-build:
-packer build -only=qemu -parallel=false -on-error=ask template.json
+packer build -machine-readable -only=qemu -parallel=false -on-error=ask template.json
 #rm -rf ~/.packer.d/