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/packer-image-buid.groovy b/packer-image-buid.groovy
index a87918f..b3d1dad 100644
--- a/packer-image-buid.groovy
+++ b/packer-image-buid.groovy
@@ -237,8 +237,8 @@
                             // collect artifacts
                             // TODO make it possible, process multiply artifacts by one run.
                             dir('images/') {
-                                sh(script: 'find .', returnStdout: true)
-                                def _files = findFiles(glob: "*qemu*/${imageName}*")
+                                sh(script: 'find .')
+                                def _files = findFiles(glob: "*${imageName}*.qcow2")
                                 if (_files.size() > 1) {
                                     common.warningMsg("Multiply artifacts detected!Only first one will be processed!")
                                 } else if (_files.size() == 0) {