CORE-1393 Simplify tarball build

With Ansible shipping in Helion images, we no longer need to build a
tarball with binary code and a virtualenv in it. So with this we just
build an archive from git directly using a simple script.

Change-Id: I1bd7d9ae66650b5f20affcf2cdc80ed495231b1e
UpstreamRef: None