Devananda van der Veen c0c6f00698 enable testing of openvz guests
This patch adds several options to allow using OpenVZ virt layer.
- modifies stack.sh and stackrc to recognize a new VIRT_TYPE option
- set IMAGE_URLS to an openvz image, if VIRT_TYPE == openvz

It also makes a few changes to some tests so that some implicit
defaults (such as the guest user account) can be overridden.

Change-Id: I0dde2dffbf3848fac1dd27eb37af84c0ac73d9aa
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