Installing Cloud SDK which includes gcutil and gsutil. We still don't have
a package for it so laying out the tarball for now.
Merge branch 'development' of https://github.com/HimanshuVasishth/bootstrap-vz into development
Fix bugs in Cloud SDK install

- Store tarball in workspace
- Replace erroneous references to gcompute with gcloud, as intended
- Make a clearly buggy attempt to handle architectures, but it's
  working?!
    - We're building amd64 images, but it's managing to install Cloud
      SDK, even though I accidentally listed the x86_64 tarball under
      i386.
    - Only the Go bits of the App Engine SDK are architecture-specific.
      Do we care about architecture for the current install bundle?
Merge branch 'cloudsdk' of https://github.com/jkaplowitz/bootstrap-vz

Change-Id: Ifa3d39aa90920c1595fb5fd676487efa6b694147
Install ca-certificates on GCE

Needed to fetch GCE startup scripts over HTTPS, among other reasons.

Change-Id: I89e3afb44f786539b5e3275b5f1f3b7201ab44fd