Clean downloaded venv after unpacking it
Clean downloaded venv after unpacking it

The VENV_VERSION.tar.gz is left in the folder
causing future runs to redownload it with an added
incremental number. Also, by not removing it, we can
accidentaly add it to the repo since it's not ignored
by git.

Change-Id: If79472121ab9cef0e5c59e41f3cf02d75092cc75

openstack/refstack-client,openstack/refstack-client,stackforge/refstack-client,stackforge/refstack-client