make.bash creates a Google Compute Engine VM image to run the Go
Plan 9 builder, booting up to run the buildlet.

make.bash should be run on a Linux box with qemu.

After it completes, it creates a file plan9-386-gce.tar.gz

The make.bash script depends on the following packages:

$ sudo apt-get install bzip2 curl expect qemu
or
$ sudo yum install bzip2 curl expect qemu

It has been tested with QEMU 1.4.2 to 2.2.0, as provided with:

 - Ubuntu 14.04 (Trusty Tahr) and above
 - Debian 8.0 (Jessie) and above
 - Fedora 19 and above

Also, due to an ATA bug affecting QEMU 1.6 and 1.7, the
Plan 9 CD can't be booted with these versions.

To create the image:
  $ ./make.bash

Then:
  $ gsutil cp -a public-read plan9-386-gce.tar.gz gs://go-builder-data/plan9-386-gce.tar.gz

Then:
  $ gcloud compute --project symbolic-datum-552 images create plan9-386-v6 --source-uri gs://go-builder-data/plan9-386-gce.tar.gz

To test the image before deploying it to prod, use x/build/cmd/debugnewvm.

Then update x/build/dashboard/builders.go with the new image version
(e.g. "plan9-386-v5" to "plan9-386-v6").
