Adds tests for Hyper-V VM Utils

Adds unit tests for Hyper-V VMUtils and VMUtilsV2 classes.

Co-Authored-By: Bogdan Teleaga <bteleaga@cloudbasesolutions.com>

Partial-Bug: #1220256
(cherry picked from commit cafa300a72313ccc7831f20ac1ca0df117a47cf5)

Conflicts:
	nova/tests/virt/hyperv/test_vmutils.py
	nova/tests/virt/hyperv/test_vmutilsv2.py

Change-Id: I87a13697b0a83dc8905573081f735b542bc9bf17
Merge "Adds tests for Hyper-V VM Utils" into stable/icehouse