1e1c8b35b9

Remove all tasks and variables related to toggling between installation of rally inside or outside of a Python virtual environment. Installing within a venv is now the only supported deployment. Additionally, a few changes have been made to make the creation of the venv more resistant to interruptions during a run of the role. * unarchiving a pre-built venv will now also occur when the venv directory is created, not only after being downloaded * virtualenv-tools is run against both pre-built and non pre-built venvs to account for interruptions during or prior to unarchiving Change-Id: I815dff623fce1440a5d60f64bf69f4f563371998 Implements: blueprint only-install-venvs
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