libvirt: don't turn time.sleep into a no-op in tests
libvirt: don't turn time.sleep into a no-op in tests

Turning time.sleep into a complete no-op causes non-deterministic
hangs in the oslo.messaging fake driver, which causes the tox test
run to timeout randomly. Take inspiration from

  commit 2809fab96c4b48f2a979965b3f4788dfb1379977
  Author: Sean Dague <sean@dague.net>
  Date:   Fri Jan 16 14:41:24 2015 -0500

    increase fake rpc POLL_TIMEOUT to 0.1s

and have it sleep for 0.1 seconds instead of being a no-op.

Closes-bug: #1412742
Change-Id: I45707cd11a101efd181654b5dd483cdd9168bb84

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