day01 Updates

  * Day01:
    - remove reclass data from node
    - Force maas in unconfigured state
      - if you will try to run maas - it will automatically start
        import processes = > which fail.
      - If you will try to wrap and disable imports (formula allow to do it)
        => maas_config step will never pass.
  * Misc:
    - for to use freezed bootstrap.saltstack.com.sh
    - add qemu-packer disk_compression true - require packer 1.10 +
    - decrease mirror image size to 100gb
    - apt_preserve_sources_list - force cloud-init to not re-create sources.list

Change-Id: If7c731284f3fd6ca21fe253c05c8ab78213cf9c5
diff --git a/common/zerodisk.sh b/common/zerodisk.sh
new file mode 100644
index 0000000..9b20b18
--- /dev/null
+++ b/common/zerodisk.sh
@@ -0,0 +1,4 @@
+dd if=/dev/zero of=/EMPTY bs=1M || true
+rm -f /EMPTY
+echo 3 > /proc/sys/vm/drop_caches
+sync