Fixes Hyper-V unit test path separator issue

Fixes an issue in a unit tests were path separators were not
handled in a platform independent way causing the test to fail
on Windows.

Change-Id: Ifca77a561e5a95af8655f2373af665292b2ca3cb
Co-Authored-By: Zsolt Dudas <zdudas@cloudbasesolutions.com>
Closes-Bug: #1358702
Merge "Fixes Hyper-V unit test path separator issue"