Hyper-V: Removes redundant utilsfactory tests from test_hypervapi

The Hyper-V driver oldest tests (test_hypervapi.py) are proving hard to
maintain.

The tests in test_hypervapi.py in particular can also be refactored and
split in separate TestCases, one of each *ops module.

This commit removes redundant utilsfactory unit tests from
test_hypervapi.

Partially implements: blueprint hyper-v-test-refactoring

Change-Id: I5ebc338005e2a25eab695dc10492febed506c86d
Merge "Hyper-V: Removes redundant utilsfactory tests from test_hypervapi"